1 Ricardo Salinas - Gemini Observatory
"The role of stellar variability in LMC intermediate-age clusters"

In the LMC intermediate-age globular clusters, the presence of extended main sequence turn off points (MSTOs), initially interpreted as evidence for multiple stellar populations, is now under scrutiny and stellar rotation has emerged as an alternative explanation. Here we propose yet another ingredient to this puzzle: the fact that the MSTO of these clusters passes through the instability strip making stellar variability a new alternative to explain this phenomenon. I will present a variability study at the MSTO level of the LMC cluster NGC 1846, which undercover ~100 short-period variables in the field, although none were detected by OGLE. Most of them are Delta Scuti pulsators, close to the MSTO. The number of Delta Scuti cannot explain the bifurcation of the TO in the NGC 1846, but probably remains as a viable explanations in cluster where only a spread at the MSTO level is seen.
2 Cesar Briceno - CTIO
"SOAR AO discovery of a large-scale Herbig-Haro Flow from a brown dwarf candidate

We present the discovery, using the SOAR Adaptive Optics Module, of a large-scale (0.23 pc) Herbig-Haro (HH) jet driven by a brown dwarf candidate. The driver is a very low-luminosity Class I object which lies at the cusp of the stellar/sub-stellar boundary and will likely evolve into a brown dwarf. The newly discovered HH object shows many of the characteristics of a large-scale jet, including a collimated structure, multiple knots, bow-shocks, a C-shaped morphology and a reflection nebula.
Though the first hints of a jet were detected in low resolution spectra, the SOAR narrow-band images revealed for the first time the spectacular nature of this unique jet, the first sub-stellar analog of a protostellar HH jet system.
3 Andrei Tokovinin - CTIO
" Observational study of stellar multiplicity"

Multiplicity statistics in the field and in young stellar populations is studied using speckle interferometry at SOAR, radial velocities, and catalogs. The main goal is to understand formation of binary and hierarchical systems, as part of the star and planet formation. During this adventure, interesting objects are discovered that highlight different aspects of their origin.
4 Morten Andersen - Gemini
"Low-mass stars in young massive resolved star clusters"

Low-mass stars in young massive resolved star clusters. Abstract Most stars form in clustered environments. Thus, if we want to understand star formation in general we have to understand it in the context of star clusters. Of particular interest is if the Initial Mass Function (IMF) is Universal or depends on star formation site. We are studying the most massive young star clusters in the Galaxy to search for variations in the IMF. Due to their high density they can only be resolved with the highest spatial resolution. I present work done using the HST and the constraints we have placed on the IMF and I show the capabilities multiconjugate adaptive optics, for example GeMS/GSAOI on Gemini South, will provide in the future.
5 Bryan Miller -Gemini
"Globular Cluster Systems"

I work on globular clusters and globular cluster systems in the nearby universe. I am working on a GeMS/GSAOI of the stellar populations in Galactic globular clusters as well as the globular cluster systems of galaxies of galaxies within 30Mpc. We are using GCs as tracers to measure mass-to-light ratios in both dwarf and giant elliptical galaxies. With DECam we are now studying globular cluster systems of galaxies out to more than 180~kpc in projected radius.
6 Mischa Schirmer - Gemini
"Low redshift Lyman-alpha blobs"

Lyman-alpha blobs (LABs) are ionized clouds with diameters of up to 100 kpc, commonly found at high redshift. They were first discovered in 1999, and are landmarks of ongoing galaxy formation. One of the biggest puzzles is that their ionization sources remain mysterious (so-called ionization deficits). I will summarize our discovery of low-redshift LABs, and how long-term variability of AGN easily explains the ionization deficits.
7 José Luis Nilo Castellón - Universidad de La Serena
"The FALCON telescope network"

In this work we present a new worldwide array of small aperture optical telescopes, designed for the study of artificial satellites and the nearby Universe : The Falcon Telescope Network (FTN)
Developed by the Center for Space Situational Awareness Research in the Department of Physics at the United States Air Force Academy(USAFA), the network is composed by 12 observatories, located in North and South America, Europe, Africa and Oceania. Designed in base of a collaborative effort, the USAFA provides the equipment (e.g. telescope, mount, camera, filter wheel, dome, weather station, computers and storage devices), all commercially available, while the partners provide the building, infrastructure and all the logistic needed to support an observatory.
The nodes will work under an automatic/robotic concept: The raw imagery, all in the public domain, will be accessible to FTN partners and will be archived at USAFA in the Cadet Space Operations Center. FTN users will be able to submit observational requests via a web interface. The requests will then be prioritized based on the type of user, the object of interest, and a user-defined priority. A network wide schedule will be developed every 24 hours and each FTN site will autonomously execute its portion of the schedule. After an observational request is completed, the FTN user will receive notification of collection and a link to the data.
The Falcon Telescope Network is an ambitious endeavor, but demonstrates the cooperation that can be achieved by multiple educational institutions.
8 Alistair Walker - NOAO/CTIO
"The DECam Legacy Survey (DECaLS) "

DECaLS is a pre-imaging survey for the DESI instrument soon to be installed on the Mayall Telescope on Kitt Peak, covering the extragalactic sky south of declination +30 deg. I'll briefly describe the survey, and the imminent data releate (DR3)
9 Verónica Firpo - Universidad de La Serena - Gemini Observatory
"Giant star-forming regions in interacting galaxies"
The most violent processes of star formation can be found in interacting galaxies, where gas compression can trigger the formation of giant star-forming regions. Using high-resolution spectroscopic information from MIKE/Magellan and multi-slit data from GMOS/Gemini-South, we propose to improve our knowledge in the chemodynamics of extragalactic star-forming regions. The current analysis is based in a sample of star-forming regions located in strongly interacting galaxies. A detailed study of the ionized gaseous component in these regions reveal a complex internal kinematic, which can be identified by asymmetric line profiles and multiple components. The kinematic information suggests that these star-forming objects corresponds to giant complexes. Future estimation of physical properties such as the electron densities, temperatures and chemical abundances of the different kinematical components will allow us to determine the chemodynamical state of these star-forming objects. This information will be extremely useful to understand the evolution of these systems in interacting galaxies.
10 Carolina Sabín-Sanjulián - Universidad de La Serena
" Quantitative study of massive stars in the Milky Way and the Large Magellanic Cloud "
My research is focused on the physical and evolutionary properties of massive stars, in particular OB-type stars. I am involved in two large spectroscopic projects: VFTS and OWN.
Within VFTS ("VLT-FLAMES Tarantula Survey", P.I.: Chris Evans), my work aims at the study of a large sample of O dwarf stars located within 30 Doradus (LMC), in order to investigate the early phases of the main-sequence of massive stars. For this task, a quantitative spectroscopic analysis of more than one hundred presumably single O dwarf stars has been performed. We have used mid-to-high resolution spectroscopic data obtained within the VFTS project. We determine stellar and wind parameters by means of IACOB-GBAT, an automatic method based on a large grid of FASTWIND models.
Within OWN ("Survey of Galactic O and WN stars", P.I.: Rodolfo Barbá), my work is focused on the study of Galactic OB stars within binary systems. Binary stars, which represent more than half of massive stars, are a unique opportunity to characterize the stellar properties by means of photometry and spectroscopy, and applying elemental physical laws. The OWN Survey has obtained thousands of high-resolution multi-epoch optical spectra of approximately 240 Galactic O and WN star and has discovered more than 100 new binary or multiple systems. Our objective is to determine fundamental parameters for SB2 systems with wide orbits and eclipsing binaries by means of 3 different methods: stellar atmosphere models, evolutionary models and dynamical processes.
11 Kathy Vivas - CTIO
" Disentangling the Virgo Overdensity with RR Lyrae stars"
We use a combination of spatial distribution and radial velocity to search for halo sub-structures in a sample of 412 RR Lyrae stars (RRLS) that covers a ~525 square degrees region of the Virgo Overdensity (VOD) and spans distances from the Sun from 4 to 75 kpc. With a friends-of-friends algorithm we identified six high significance groups of RRLS in phase space, which we associate mainly with the VOD and with the Sagittarius stream. Four other groups were also flagged as less significant overdensities. The VOD appears to be caused by more than one overdensity. The Sgr stream is a very obvious feature in the background of the VOD at a mean distance of 44 kpc. Two additional high significant groups were detected at distances >40$ kpc. Their radial velocities and locations differ from the expected path of the Sgr debris in this part of the sky, and they are likely to be remnants of other accretion events.
12 Rodrigo Carrasco - Gemini Observatory
" Dissecting the mass profile of the galaxy cluster MS0440.5+0440 using dynamical and strong lensing constrains "

The galaxy cluster MS0440.5+0204 at z=0.19 has several lensing features, including two gravitational arcs whose radially-symmetric distortion pattern suggests that it may be classified as a regular cluster. We have used GMOS at Gemini South and the Multi-object Spectrograph at CHFT to measure the redshift of the most prominent lensed features and ~200 galaxies inside 0.3 x 0.4 square degrees around the cluster. In this work we present a detailed strong lensing and dynamical analysis of the galaxy cluster MS0440.5+0204 based on confirmed redshift, measured for first time, of the most prominent lensed features in the cluster and from 92 confirmed member galaxies. The large number of member galaxies and the redshift confirmation for the arc systems allowed to characterize the mass profile from the strong lensing region of the cluster up to medium scales, using dynamical constrains, and quantitatively discriminate between different models.
13 Mark M. Phillips - Las Campanas Observatory
"The Carnegie Supernova Project "

The Carnegie Supernova Project (CSP) was initiated in Sep. 2004 to establish a fundamental data set of optical and NIR light curves in a well­-defined and understood photometric system. The CSP­ took advantage of the unique resources available to us at the Las Campanas Observatory (LCO), and was funded by the NSF for its 5­-year duration. Optical imaging was obtained on over 1000 nights with the LCO Swope 1 m telescope in the SDSS u​gri ​filters and Johnson B​V​ filters. The NIR imaging was obtained with the Swope telescope and the LCO 2.5 m du Pont telescope, mostly in the Y​JH​ bandpasses. Over the 5­-year duration of the project, optical light curves were obtained for 134 SNe Ia, 93 SNe II, and 31 SNe Ib/Ic/IIb, with NIR photometry having been obtained for ~85% of these.
14 Karleyne Medeiros Gomes da Silva - Gemini Observatory
"Optical modeling of Polars "

Polars are a subclass of cataclysmic variables: short-period binaries where most of their emission comes from the accretion process developed thanks to Roche Lobe overflow of the secondary star. In the optical region, the flux is dominated by cyclotron radiation provenient of the auroral regions of a highly magnetic white dwarf that accretes the transferred material via its magnetic field lines. The physical and geometrical properties of these binaries can be recovered by modeling the broadband optical light curves and the phase-resolved optical polarimetric curves. In this presentation I will show the modeling results of the mentioned optical data for a sample of southern polars.
15 Malcolm G. Smith - Cerro Tololo Interamerican Observatory
"Continuing IDA Certification of the Gabriela Mistral Dark Sky Sanctuary"

A brief update is given on recent work in support of continuing certification by the International Dark-Sky Association ( darksky.org/idsp/sanctuaries/ ) of the AURA-O Observatory Site.
16 Sergio Torres Flores - Universidad de La Serena
"Oxygen abundances and kinematic of galaxies in compact groups and interacting systems "

I work on compact groups and interacting galaxies. We have used Halpha Fabry-Perot data to study the kinematic of the ionized gas belonging to galaxies in compact groups, finding perturbed velocity fields and non-circular motions, which suggests the existence of gas flows in these galaxies. The kinematic information has been complemented with GMOS multislit spectroscopic data to determine the metal distribution in these interacting galaxies. We have found that interacting galaxies (in compact groups) display flatter metal distributions than field galaxies. The flattening in the metal distribution could be produced by gas flows triggered during the galaxy-galaxy encounters, which is consistent with the kinematic displayed by these galaxies. Finally, we are interested in determine the ionization mechanism of the nuclear region of galaxies belonging to compact groups.
17 Sergio Torres Flores - Universidad de La Serena
"The new PhD in Astronomy program at Universidad de La Serena "
The Universidad de La Serena is starting a PhD program in Astronomy in March 2017. This new program presents a huge opportunity for people working at ULS and local observatories to start new collaborations. In this short talk I will describe the program, indicating the different possibilities to create new collaborations (e.g., guide PhD thesis as a co-supervisor, participate in the different "Talleres de Investigación", among others). We hope that this PhD program will strengthen the scientific and academic interaction between ULS and Gemini, LCO, CTIO, SOAR and LSST.
18 Fredrik Rantakyro - Gemini
"GPI Observations of stellar winds and outflows in Be Stars "
Be stars are stars that have rotation close to critical and thus forming a decretion disk and in many cases polar outflows. These type of stars have been studied with IR interferometry and recently many studies with ALMA. GPI observations of these objects fills the gap between the IR interferometry and Radio interferometry.
19 David Osip - Las Campanas Observatory
"Chasing shadows across Las Campanas Observatory "
Looking into the shadows can often reveal details not readily discovered in the light. My current research efforts focus on studies of several different three-body alignments to infer physical/chemical properties not readily discoverable by other means. I will present ongoing efforts in the following three categories: 1. stellar occultations by distant solar system bodies, 2. mutual eclipse events of small solar system bodies, and 3. photometric and spectroscopic studies of transiting extra solar planets. Meal choise
20 Konstantina Boutsia - Las Campanas Observatory
"K detected galaxies in GOODS-South"
Deep imaging surveys play a key role in exploring galaxy formation and evolution using the techniques of color selection and photometric redshifts. Here I will present a K-selected sample in the CANDELS field GOODS-South, based on images obtained for the HUGS survey (Fontana et al. 2014). The aim of this exercise is to implement the H-selected catalog presented by Guo et al. (2013) and explore the nature of undetected sources.
21 Nancy Levenson - Gemini Observatory
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22 José Luis Nilo Castellón - Universidad de La Serena
"The SES-VVV program : The Search for Extragalactic Sources in the VISTA Variables in the Via Lactea Survey"
I will present the first results obtained by the project "Search for Extragalactic Sources in the VISTA Variables in the Via Lactea Survey" (SES-VVV project), the first systematic program devoted to define the Large Scale Structure of the Universe obscured by the bulge and the plane of the Milky Way (MW), in the area covered by the VVV survey.
By reprocessing the VVV images with a new PSF fitting photometry software, our first results show that is possible to detect, within a 90% of completness, objects 2 magnitud faintest that those detected by previous works. By applying this technique in two low extinction regions in the direction of the fourth quadrant of the MW, we found more than 100 new extragalactic sources.
Also i will show the first galaxy cluster discovered by the SES-VVV program, ad portas to be confirmed, thanks to near infrared (NIR) spectroscopic observations obtained recently in Gemini South using FLAMINGOS-2. (GS-2016A-FT-18)
23 Mario Humberto Soto Vicencio - Universidad de Atacama
"Multiple Stellar Populations in Globular Clusters using HST WFC3/UVIS "
We report on the results of the Hubble Space Telescope UV Legacy Survey of Globular Clusters. This survey has been planned to observe 57 Globular Clusters in three UV filters with WFC3/UVIS.
These UV filters, F275W, F336W, and F438W, allow the detection of multiple stellar population in Globular Clusters by targeting the abundance variations in molecular bands including C,N and O.
The new data complements the existing ACS Survey of Globular Clusters catalogs (GO-10775),allowing the construction of 5-band catalogs which will be released to the community this year.
24 Steven Margheim - Gemini Observatory
"Kepler - Not just for planets"
I will present my work on Supernovae and the central stars of planetary nebula using the Kepler/K2 spacecraft and Gemini.
25 Mauro Barbieri - Universidad de Atacama
"IMPROVING TRILEGAL FOR LSST "
LSST will demand a large effort from researchers working on Galactic models, in the years ahead. LSST will be able to sample large areas of the Galaxy, from the Galactic center to the Milky Way outskirts. This will pose a special challenge to dynamical and chemical evolution models of the Galaxy, and also to population synthesis models like the TRIdimensional modeL of thE GALaxy (TRILEGAL; Girardi et al. 2005). There's a price to pay in any photometric survey that samples very large area of the sky: they contain targets of unknown distance, there will be important biases effects, that have to be understood for the interpretation of the distribution of the stellar population of the Galax. One way of studying biases effects is using TRILEGAL for simulating mock catalogues using the same criteria as in the observed sample. A number of modifications to TRILEGAL is necessary in order to make it fully comparable with these large databases. These modifications include, but are not limited to:
1. Optimization of the input parameters using up-to-date constraints;
2. Considerations of radial and time variations in the star formation rate and metallicity distribution;
3. Better treatment of the extinction towards high Av lines of sight;
4. Include generation of light curves of variable stars according to the temporal sampling of the survey;
5. Improvements in the disk density law (considering the effect of the Galactic warp and flare);
6. Improve the simulation of binaries.
In this talk I will present the improvement that I am doing in collaboration with L. Girardi on the treatment of the extinction and in binary evolution.
26 Guillermo Damke - Universidad de La Serena
"The tidal tails of the Sagittarius dwarf galaxy"
We use a set photometric and spectroscopically selected M-giant stars to trace the tidal tails of the Sagittarius dwarf galaxy, for over 2-pi radians on the sky. In addition, we estimate radial velocities using the near-IR Ca II triplet.
We compare the position on sky of the tidal tails against N-body models of the disruption of the satellite by the Milky Way potential to estimate the oblateness of the dark matter halo of the Milky Way.
In addition, we will present a modification of the Ca Triplet method to allow metallicity estimation of RGB stars with unknown distances. Finally, we apply this method to our M-giant sample and derive metallicities of the stars along the stream..
27 Alfredo Zenteno - NOAO/CTIO
"Science with colliding galaxy clusters"
I will show science that I am pursuing by characterizing the South Pole Telescope SZ-survey cluster sample.
28 Rodolfo Barba - Universidad de La Serena
"Massive binary stars "
29 Julia Arias - Universidad de La Serena
" Main sequence massive stars"
30 Francesco Di Mille - Las Campanas Observatory
"Classical Novae in Nearby Galaxies"
The total energy released during the outburst of a classical nova is only exceeded by gamma ray bursts supernovae and some luminous blue variables. By virtue of their high luminosity, classical novae can be detected well outside the Local Group, up to the nearest large Galaxy clusters.During the first phase of the outburst, novae exhibits a strong H-alpha emission that usually has a decline rate much slower of the optical broad-band light curve. Therefore, narrow band imaging centered on Halpha can be used to facilitate a search whenever a frequent monitoring is not possible. In this poster we present some preliminary results of an extragalactic nova survey that we are conducting at Las Campanas Observatory.
31 James Turner - Gemini Observatory
"Working productively with GMOS IFU data reduction in Python"
In conjunction with the "Green Beans" science project described separately by Mischa Schirmer, I have scripted our GMOS IFU data reduction as a Python process that is much more productive to work with than its CL predecessor, allows new Python code to be mixed freely with existing IRAF steps and works with the new Gemini archive to provide automated calibration associations and downloads. This process presents data conveniently as groups of AstroPy NDData objects, mapped to files, and most of its framework (available on github and PyPI) could easily be re-used for other instruments.
32 Héctor Cuevas - Universidad de La Serena
"Unveiling the formation of clusters around quasar groups"
The redshift interval z ~ 1-3 was a crucial epoch for the evolution of today’s massive virialized clusters (mass ~ 10^15 Mo). According to numerical simulations in LCDM, at this epoch the first clusters assembled from the filamentary cosmic web, forming the first cluster-sized dark matter halos (mass ~ 10^14 Mo) and associated gas and galaxies. While the cosmic star formation rate in the universe as a whole was at a maximum, star formation in these dense ”proto-cluster” environments already started to cease, in concordance with the red sequence and the morphology-density relation seen at z$<$1. Although galaxy clusters are relatively well understood, we still know little about their formation mainly because X-ray surveys lack the necessary sensitivity at z>1. We plan to increase significantly the number of high-z (proto-)clusters using a novel search technique. Quasar groups (at least 3 members) are extremely rare systems, that may pinpoint extremely biased regions at the nodes of the cosmic web, the likely locations where galaxy clusters form.
33 Steve Heathcote - NOAO
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34 Luciano Garcia - UNC-OAC
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35 Rene Rutten - Gemini South Observatory
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