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Metallicity Distribution Functions of 13 Ultra-faint Dwarf Galaxy Candidates from Hubble Space Telescope Narrowband Imaging
Dolphin, Andrew E.; Martin, Nicolas; Starkenburg, Else +10 more
We present uniformly measured stellar metallicities of 463 stars in 13 Milky Way (MW) ultra-faint dwarf galaxies (UFDs; M V = -7.1 to -0.8) using narrowband CaHK (F395N) imaging taken with the Hubble Space Telescope. This represents the largest homogeneous set of stellar metallicities in UFDs, increasing the number of metallicities in…
Near-IR and optical radial velocities of the active M dwarf star Gl 388 (AD Leo) with SPIRou at CFHT and SOPHIE at OHP. A 2.23 day rotation period and no evidence for a corotating planet
Bouchy, F.; Deleuil, M.; Moutou, C. +36 more
Context. The search for extrasolar planets around the nearest M dwarfs is a crucial step toward identifying the nearest Earth-like planets. One of the main challenges in this search is that M dwarfs can be magnetically active and stellar activity can produce radial velocity (RV) signals that could mimic those of a planet.
Aims: We aim to inve…
LensWatch. I. Resolved HST Observations and Constraints on the Strongly Lensed Type Ia Supernova 2022qmx ("SN Zwicky")
Poidevin, F.; Shirley, R.; Marques-Chaves, R. +42 more
Supernovae (SNe) that have been multiply imaged by gravitational lensing are rare and powerful probes for cosmology. Each detection is an opportunity to develop the critical tools and methodologies needed as the sample of lensed SNe increases by orders of magnitude with the upcoming Vera C. Rubin Observatory and Nancy Grace Roman Space Telescope. …
Quantifying the energetics of molecular superbubbles in PHANGS galaxies
Boquien, M.; Chevance, M.; Dale, D. A. +26 more
Context. Star formation and stellar feedback are interlinked processes that redistribute energy, turbulence, and material throughout galaxies. Because young and massive stars form in spatially clustered environments, they create pockets of expanding gas termed superbubbles, which retain information about the physical processes that drive them. As …
Cannibals in the thick disk. II. Radial-velocity monitoring of the young α-rich stars
Jorissen, A.; Jofré, P.; Tayar, J. +6 more
Context. Determining ages of stars for reconstructing the history of the Milky Way remains one of the most difficult tasks in astrophysics. This involves knowing when it is possible to relate the stellar mass with its age and when it is not. The young α-rich (YAR) stars present such a case in which we are still not sure about their ages because th…
The CARMENES search for exoplanets around M dwarfs. Wolf 1069 b: Earth-mass planet in the habitable zone of a nearby, very low-mass star
Nagel, E.; Amado, P. J.; Caballero, J. A. +47 more
We present the discovery of an Earth-mass planet (Mb sin i = 1.26 ± 0.21 M⊕) on a 15.6 d orbit of a relatively nearby (d ~ 9.6 pc) and low-mass (0.167 ± 0.011 M⊙) M5.0 V star, Wolf 1069. Sitting at a separation of 0.0672 ± 0.0014 au away from the host star puts Wolf 1069 b in the habitable zone (HZ), receiving an i…
PHANGS-JWST First Results: Dust-embedded Star Clusters in NGC 7496 Selected via 3.3 µm PAH Emission
Sandstrom, Karin M.; Kruijssen, J. M. Diederik; Leroy, Adam K. +38 more
The earliest stages of star formation occur enshrouded in dust and are not observable in the optical. Here we leverage the extraordinary new high-resolution infrared imaging from JWST to begin the study of dust-embedded star clusters in nearby galaxies throughout the Local Volume. We present a technique for identifying dust-embedded clusters in NG…
Early Planet Formation in Embedded Disks (eDisk). III. A First High-resolution View of Submillimeter Continuum and Molecular Line Emission toward the Class 0 Protostar L1527 IRS
Kwon, Woojin; Lai, Shih-Ping; Han, Ilseung +25 more
Studying the physical and chemical conditions of young embedded disks is crucial to constrain the initial conditions for planet formation. Here we present Atacama Large Millimeter/submillimeter Array observations of dust continuum at ~0.″06 (8 au) resolution and molecular line emission at ~0.″17 (24 au) resolution toward the Class 0 protostar L152…
Revised Extinctions and Radii for 1.5 Million Stars Observed by APOGEE, GALAH, and RAVE
Bi, Shaolan; Yu, Jie; Khanna, Shourya +4 more
Asteroseismology has become widely accepted as a benchmark for accurate and precise fundamental stellar properties. It can therefore be used to validate and calibrate stellar parameters derived from other approaches. Meanwhile, one can leverage large-volume surveys in photometry, spectroscopy, and astrometry to infer stellar parameters over a wide…
The chemical inventory of the inner regions of planet-forming disks – the JWST/MINDS program
Henning, Thomas; Waters, L. B. F. M.; Güdel, Manuel +40 more
The Mid-InfraRed Instrument/Medium-Resolution Spectrometer (MIRI/MRS) on board the James Webb Space Telescope reveals the rich and diverse chemistry in the planet forming regions around Sun-like and low-mass stars. The understanding of planet formation has changed recently, embracing the new idea of pebble accretion. This means that the influx of …