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A 1.46-2.48 µm spectroscopic atlas of a T6 dwarf (1060 K) atmosphere with IGRINS: first detections of H2S and H2, and verification of H2O, CH4, and NH3 line lists
Fortney, Jonathan J.; Metchev, Stanimir; Morley, Caroline V. +5 more
We present Gemini South/IGRINS observations of the 1060 K T6 dwarf 2MASS J08173001-6155158 with unprecedented resolution ($R\equiv \lambda /\Delta \lambda =45\, 000$) and signal-to-noise ratio (S/N > 200) for a late-type T dwarf. We use this benchmark observation to test the reliability of molecular line lists used up-to-date atmospheric models…
The Solar Neighborhood. XLIX. New Discoveries and Orbits of M-dwarf Multiples with Speckle Interferometry at SOAR
Henry, Todd J.; Tokovinin, Andrei; Winters, Jennifer G. +3 more
We present the first results of a multiyear program to map the orbits of M-dwarf multiples within 25 pc. The observations were conducted primarily during 2019-2020 using speckle interferometry at the Southern Astrophysical Research Telescope in Chile, using the High-Resolution Camera mounted on the adaptive optics module (HRCam+SAM). The sample of…
Clusters of galaxies up to z = 1.5 identified from photometric data of the Dark Energy Survey and unWISE
Han, J. L.; Wen, Z. L.
Using photometric data from the Dark Energy Survey and the Wide-field Infrared Survey Explorer, we estimate photometric redshifts for 105 million galaxies using the nearest-neighbour algorithm. From such a large data base, 151 244 clusters of galaxies are identified in the redshift range of 0.1 < z ≲ 1.5 based on the overdensity of the total st…
The CARMENES search for exoplanets around M dwarfs. Stable radial-velocity variations at the rotation period of AD Leonis: A test case study of current limitations to treating stellar activity
Amado, P. J.; Bauer, F. F.; Caballero, J. A. +34 more
Context. A challenge with radial-velocity (RV) data is disentangling the origin of signals either due to a planetary companion or to stellar activity. In fact, the existence of a planetary companion has been proposed, as well as contested, around the relatively bright, nearby M3.0 V star AD Leo at the same period as the stellar rotation of 2.23 da…
Galactic ArchaeoLogIcaL ExcavatiOns (GALILEO). I. An updated census of APOGEE N-rich giants across the Milky Way
Beers, Timothy C.; Minniti, Dante; Chiappini, Cristina +9 more
We use the 17th data release of the second phase of the Apache Point Observatory Galactic Evolution Experiment (APOGEE-2) to provide a homogenous census of N-rich red giant stars across the Milky Way (MW). We report a total of 149 newly identified N-rich field giants toward the bulge, metal-poor disk, and halo of our Galaxy. They exhibit significa…
SRG/ART-XC all-sky X-ray survey: Catalog of sources detected during the first year
Sunyaev, R.; Krivonos, R.; Sazonov, S. +20 more
We present a first catalog of sources detected by the Mikhail Pavlinsky ART-XC telescope on board the SRG observatory in the 4-12 keV energy band during its ongoing all-sky survey. The catalog comprises 867 sources detected on the combined map of the first two 6-month scans of the sky (December 2019-December 2020), ART-XC sky surveys 1 and 2, or A…
Extragalactic Magnetism with SOFIA (SALSA Legacy Program). IV. Program Overview and First Results on the Polarization Fraction
Reach, William T.; Dale, Daniel A.; Lopez-Rodriguez, Enrique +12 more
We present the first data release of the Survey on extragALactic magnetiSm with SOFIA (SALSA Legacy Program) with a set of 14 nearby (<20 Mpc) galaxies with resolved imaging polarimetric observations using HAWC+ from 53 to 214 µm at a resolution of 5″-18″ (90 pc-1 kpc). We introduce the definitions of and background on extragalactic magne…
Origin of highly r-process-enhanced stars in a cosmological zoom-in simulation of a Milky Way-like galaxy
Beers, Timothy C.; Hirai, Yutaka; Saitoh, Takayuki R. +5 more
The r-process-enhanced (RPE) stars provide fossil records of the assembly history of the Milky Way (MW) and the nucleosynthesis of the heaviest elements. Observations by the R-Process Alliance (RPA) and others have confirmed that many RPE stars are associated with chemo-dynamically tagged groups, which likely came from accreted dwarf galaxies of t…
Underestimation of the dust mass in protoplanetary disks: Effects of disk structure and dust properties
Fang, Min; Flock, Mario; Henning, Thomas +6 more
The total number of dust grains in protoplanetary disks is one of the key properties that characterizes the potential for planet formation. With (sub-)millimeter flux measurements, literature studies usually derive the dust mass using an analytic formula under the assumption of optically thin emission, which may lead to a substantial underestimati…
SORA: Stellar occultation reduction and analysis
Sicardy, B.; Gomes-Júnior, A. R.; Braga-Ribas, F. +6 more
The stellar occultation technique provides competitive accuracy in determining the sizes, shapes, astrometry, etc., of the occulting body, comparable to in-situ observations by spacecraft. With the increase in the number of known Solar system objects expected from the LSST, the highly precise astrometric catalogs, such as Gaia, and the improvement…