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CME Evolution in the Structured Heliosphere and Effects at Earth and Mars During Solar Minimum
Nitta, Nariaki V.; Holmström, Mats; Futaana, Yoshifumi +13 more
The activity of the Sun alternates between a solar minimum and a solar maximum, the former corresponding to a period of "quieter" status of the heliosphere. During solar minimum, it is in principle more straightforward to follow eruptive events and solar wind structures from their birth at the Sun throughout their interplanetary journey. In this p…
A Census of Optically Dark Massive Galaxies in the Early Universe from Magnification by Lensing Galaxy Clusters
Kong, Xu; Zheng, Wei; Liu, Daizhong +10 more
We present ALMA 870 µm and JCMT/SCUBA2 850 µm dust continuum observations of a sample of optically dark and strongly lensed galaxies in cluster fields. The ALMA and SCUBA2 observations reach a median rms of ~0.11 mJy and 0.44 mJy, respectively, with the latter close to the confusion limit of the data at 850 µm. This represents on…
Detections of solar-like oscillations in dwarfs and subgiants with Kepler DR25 short-cadence data
García, R. A.; Mosser, B.; Mathur, S. +6 more
During the survey phase of the Kepler mission, several thousand stars were observed in short cadence, allowing for the detection of solar-like oscillations in more than 500 main-sequence and subgiant stars. These detections showed the power of asteroseismology in determining fundamental stellar parameters. However, the Kepler Science Office discov…
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…