Search Publications
TREX: Kinematic Characterization of a High-dispersion Intermediate-age Stellar Component in M33
Williams, Benjamin F.; Gilbert, Karoline M.; Guhathakurta, Puragra +7 more
The dwarf galaxy Triangulum (M33) presents an interesting testbed for studying stellar halo formation: it is sufficiently massive so as to have likely accreted smaller satellites, but also lies within the regime where feedback and other "in situ" formation mechanisms are expected to play a role. In this work, we analyze the line-of-sight kinematic…
Deep search for glycine conformers in Barnard 5
Bergman, P.; Charnley, S. B.; Carl, Tadeus +3 more
One of the most fundamental hypotheses in astrochemistry and astrobiology states that crucial biotic molecules like glycine (NH2CH2COOH) found in meteorites and comets are inherited from early phases of star formation. Most observational searches for glycine in the interstellar medium have focused on warm high-mass molecular …
CWISE J105512.11+544328.3: A Nearby Y Dwarf Spectroscopically Confirmed with Keck/NIRES
Meisner, Aaron M.; Cushing, Michael C.; Kirkpatrick, J. Davy +14 more
Y dwarfs, the coolest known spectral class of brown dwarfs, overlap in mass and temperature with giant exoplanets, providing unique laboratories for studying low-temperature atmospheres. However, only a fraction of Y dwarf candidates have been spectroscopically confirmed. We present Keck/NIRES near-infrared spectroscopy of the nearby (d ≈ 6-8 pc) …
The Black Hole Candidate Swift J1728.9-3613 and the Supernova Remnant G351.9-0.9
Raymond, John; Ray, Paul S.; Zoghbi, Abderahmen +12 more
A number of neutron stars have been observed within the remnants of the core-collapse supernova explosions that created them. In contrast, black holes are not yet clearly associated with supernova remnants (SNRs). Indeed, some observations suggest that black holes are "born in the dark," i.e., without a supernova explosion. Herein, we present a mu…
AutoSourceID-FeatureExtractor. Optical image analysis using a two-step mean variance estimation network for feature estimation and uncertainty characterisation
Groot, P. J.; Vreeswijk, P.; Nelemans, G. +9 more
Aims: In astronomy, machine learning has been successful in various tasks such as source localisation, classification, anomaly detection, and segmentation. However, feature regression remains an area with room for improvement. We aim to design a network that can accurately estimate sources' features and their uncertainties from single-band im…
A Catalog of New Slowly Pulsating B-type Stars
Shi, Xiang-dong; Qian, Sheng-bang; Zhu, Li-ying +1 more
This paper reports the discovery of new slowly pulsating B-type stars. Based on the photometric, spectral, and astrometric data of the TESS, LAMOST, and Gaia surveys, we have found 286 new slowly pulsating B-type (SPB) stars and 21 candidates. Among these, 20 are Be stars or candidates with emission-line profiles. It is shown that these SPB stars …
X-ray emission from Ae/Be Herbig stars due to disc-stellar magnetosphere interaction
Lyutikov, Maxim; Ryspaeva, Elizaveta; Kholtygin, Alexander
We reanalyse archival X-ray data of 16 Ae/Be Herbig stars obtained by the XMM-Newton and Chandra satellites. Stellar X-ray spectra in the energy range 0.2-8 keV were fitted with the use of APEC and MEKAL hot plasma emission models, and with models with an additional power-law component. We find that for Herbig stars, the dependence of the unabsorb…
Multiple Rings and Asymmetric Structures in the Disk of SR 21
Dong, Ruobing; Tamura, Motohide; Liu, Hauyu Baobab +9 more
Crescent-like asymmetric dust structures discovered in protoplanetary disks indicate dust aggregations. Thus, researching these structures helps us understand the planet formation process. Here we analyze ALMA data of the protoplanetary disk around the T-Tauri star SR 21, which has asymmetric structures that were detected in previous submillimeter…
NAROO program. Precovery observations of potentially hazardous asteroids
Hestroffer, D.; Desmars, J.; Robert, V. +1 more
Context. The New Astrometric Reduction of Old Observations (NAROO) program is dedicated to the measurement of astrophotographic plates and the analysis of old observations for scientific purposes. One of the objectives of the NAROO program is to provide accurate positional measurements of small Solar System bodies in order to improve our knowledge…
Field blue straggler stars: discovery of white dwarf companions to blue metal-poor stars using UVIT/AstroSat
Subramaniam, Annapurni; Panthi, Anju; Vaidya, Kaushar +4 more
Blue metal-poor (BMP) stars are the main-sequence stars that appear bluer and more luminous than normal turn-off stars of metal-poor globular clusters. They are believed to be either field blue straggler stars (FBSS) formed via post-mass transfer mechanism or accreted from dwarf satellite galaxies of the Milky Way. A significant fraction of BMP st…