137 citations · 677 across the 28 of their papers we have counts for
17 papers · 1 filter
ABYSS II: Identification of young stars in optical SDSS spectra and their properties
Serat Saad, Kaitlyn Lane, Marina Kounkel +9
We developed a tool that measures equivalent widths of various lines in low resolution optical spectra, and it was applied to stellar spectra obtained as part of SDSS-V and LAMOST…
Spectroscopic substellar initial mass function of NGC 2244
V. Almendros-Abad, K. Mužić, H. Bouy +10
We aim at characterizing the low-mass (sub)stellar population of the central portion (2.4 pc) of the 2 Myr old cluster NGC 2244 using near infrared spectroscopy. By study…
Pre-main Sequence Brackett Emitters in the APOGEE DR17 Catalog: Line Strengths and Physical Properties of Accretion Columns
Hunter Campbell, Elliott Khilfeh, Kevin R. Covey +21
Very young (t 10 Myrs) stars possess strong magnetic fields that channel ionized gas from the interiors of their circumstellar discs to the surface of the star. Upon imp…
Discovery of a brown dwarf with quasi-spherical mass-loss
Dary A. Ruíz-Rodríguez, Lucas A. Cieza, Simon Casassus +14
We report the serendipitous discovery of an elliptical shell of CO associated with the faint stellar object SSTc2d J163134.1-24006 as part of the "Ophiuchus Disk Survey Employing A…
Stellar Rotation of T Tauri stars in the Orion Star-Forming Complex
Javier Serna, Jesús Hernández, Marina Kounkel +14
We present a large-scale study of stellar rotation for T Tauri stars in the Orion Star-Forming Complex. We use the projected rotational velocity () estimations reported b…
Close companions around young stars
Marina Kounkel, Kevin Covey, Maxwell Moe +26
Multiplicity is a fundamental property that is set early during stellar lifetimes, and it is a stringent probe of the physics of star formation. The distribution of close companion…
Optical and near-infrared linear polarization of low and intermediate-gravity ultra-cool dwarfs
P. A. Miles-Páez, M. R. Zapatero Osorio, E. Pallé +1
We aim to study the optical and near-infrared linear polarimetric properties of a sample of young M7-L7 dwarfs (1-500 Myr) with spectroscopic signatures of low- and interm…
Physical parameters of late M-type members of Chamaleon I and TW Hydrae Association: Dust settling, age dispersion and activity
A. Bayo, D. Barrado, F. Allard +6
Although mid-to-late type M dwarfs are the most common stars in our stellar neighborhood, our knowledge of these objects is still limited. Open questions include the evolution of t…
VVV High proper motion stars I. The catalogue of bright Ks < 13.5 stars
R. Kurtev, M. Gromadzki, J. C. Beamin +14
Knowledge of the stellar content near the Sun is important for a broad range of topics ranging from the search for planets to the study of Milky Way structure. The most powerful me…
A new free-floating planet in the Upper Scorpius association
K. Peña Ramírez, V. J. S. Béjar, M. R. Zapatero Osorio
We report on a deep photometric survey covering an area of 1.17 deg in the young Upper Scorpius stellar association using VIMOS and UKIDSS data taking several years…
Characterization of the known T type dwarfs towards the Sigma Orionis cluster
K. Peña Ramírez, M. R. Zapatero Osorio, V. J. S. Béjar
(Abridged) A total of three T type candidates (SOri70, SOri73, and SOriJ0538-0213) lying in the line of sight towards Sigma Orionis were characterized by means of near-infrared pho…
VVV High Proper Motion Survey
M. Gromadzki, R. Kurtev, S. Folkes +7
Here we present survey of proper motion stars towards the Galactic Bulge and an adjacent plane region base on VISTA-VVV data. The searching method based on cross-matching photometr…
Linear polarization of rapidly rotating ultracool dwarfs
Paulo Alberto Miles-Páez, María Rosa Zapatero Osorio, Enric Pallé +1
Aims. We aim at studying the near infrared linear polarization signal of rapidly rotating ultracool dwarfs with spectral types ranging from M7 through T2 and projected rotational v…
A new L-dwarf member of the moderately metal-poor triple system HD 221356
B. Gauza, V. J. S. Béjar, R. Rebolo +10
We report on the discovery of a fourth component in the HD 221356 star system, previously known to be formed by an F8V, slightly metal-poor primary ([Fe/H]=-0.26), and a distant M8…
New isolated planetary mass objects and the stellar and substellar mass function of the sigma Orionis cluster
K. Peña Ramírez, V. J. S. Béjar, M. R. Zapatero Osorio +2
We report on our analysis of the VISTA Orion ZYJHKs photometric data (completeness magnitudes Z=22.6 and J=21.0mag) focusing on a circular area of 2798.4 arcmin^2 around the young…
Near-infrared Linear Polarization of Ultracool Dwarfs
M. R. Zapatero Osorio, V. J. S. Béjar, B. Goldman +5
We report on near-infrared J- and H-band linear polarimetric photometry of eight ultracool dwarfs (two late-M, five L0-L7.5, and one T2.5) with known evidence for photometric varia…
Search and characterization of T-type planetary mass candidates in the sigma Orionis cluster
K. Peña Ramírez, M. R. Zapatero Osorio, V. J. S. Béjar +2
(Abridged) We aim to: i) confirm the presence of methane absorption in S Ori 73 (a T-type member candidate of the sig Orionis cluster, 3 Myr, 352 pc) through methane imaging; ii) s…