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Using Ly α transits to constrain models of atmospheric escape
Schreyer, Ethan; Owen, James E.; Loyd, R. O. Parke +1 more
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A Formally Motivated Retrieval Framework Applied to the High-resolution Transmission Spectrum of HD 189733 b
Blain, Doriann; Sánchez-López, Alejandro; Mollière, Paul
Ground-based high-resolution spectra provide a powerful tool for characterizing exoplanet atmospheres. However, they are greatly hampered by the dominating telluric and stellar lines, which need to be removed prior to any analysis. Such removal techniques ("preparing pipelines") deform the spectrum; hence, a key point is to account for this proces…
JWST Observations of Young protoStars (JOYS): Overview of gaseous molecular emission and absorption in low-mass protostars
Güdel, M.; Ray, T. P.; Chen, Y. +17 more
Context. The Mid-InfraRed Instrument (MIRI) on board the James Webb Space Telescope (JWST) allows one to probe the molecular gas composition at mid-infrared (mid-IR) wavelengths with unprecedented resolution and sensitivity. It is important to study these features in low-mass embedded protostellar systems, since the formation of planets is thought…
Giant molecular clouds and their type classification in M 74: Toward understanding star formation and cloud evolution
Kobayashi, Masato I. N.; Tokuda, Kazuki; Tachihara, Kengo +10 more
We investigated the giant molecular clouds (GMCs) in M 74 (NGC 628), using data obtained from the PHANGS (Physics at High Angular resolution in Nearby GalaxieS) project. We applied GMC types according to the activity of star formation: Type I without star formation, Type II with H
HSTPROMO Internal Proper-motion Kinematics of Dwarf Spheroidal Galaxies. I. Velocity Anisotropy and Dark Matter Cusp Slope of Draco
van der Marel, Roeland P.; Watkins, Laura L.; Bellini, Andrea +8 more
We analyze four epochs of Hubble Space Telescope imaging over 18 yr for the Draco dwarf spheroidal galaxy. We measure precise proper motions for hundreds of stars and combine these with existing line-of-sight (LOS) velocities. This provides the first radially resolved 3D velocity dispersion profiles for any dwarf galaxy. These constrain the intrin…
The X-ray rise and fall of the symbiotic recurrent nova system T CrB
Sacchi, Andrea; Toalá, Jesús A.; González-Martín, Omaira +1 more
We present the analysis of publicly available NuSTAR, Suzaku, and XMM-Newton observations of the symbiotic recurrent nova T CrB covering the 2006.77-2022.66 yr period. The X-ray spectra are analysed by adopting a model that includes a reflection component produced by the presence of a disc that mimics the accretion disc and the immediate surroundi…
Gaia22dkvLb: A Microlensing Planet Potentially Accessible to Radial-velocity Characterization
Gromadzki, M.; Huang, Yang; Liu, Chang +50 more
We report discovering an exoplanet from following up a microlensing event alerted by Gaia. The event Gaia22dkv is toward a disk source rather than the traditional bulge microlensing fields. Our primary analysis yields a Jovian planet with at a projected orbital separation au, and the host is a ∼1.1 M ⊙ turnoff star at ∼1.3 kpc. At , the…
DIAmante TESS AutoRegressive Planet Search (DTARPS). II. Hundreds of New TESS Candidate Exoplanets
Feigelson, Eric D.; Montalto, Marco; Melton, Elizabeth J. +3 more
The DIAmante TESS AutoRegressive Planet Search for the southern ecliptic hemisphere (DTARPS-S) project seeks to identify photometric transiting planets from 976,814 southern hemisphere stars observed in Year 1 of the TESS mission. This paper follows the methodology developed by Melton et al. (Paper I) using light curves extracted and preprocessed …
The discovery of a z = 0.7092 OH megamaser with the MIGHTEE survey
Adams, Elizabeth A. K.; Baes, Maarten; Heywood, Ian +18 more
We present the discovery of the most distant OH megamaser (OHM) to be observed in the main lines, using data from the MeerKAT International Giga-Hertz Tiered Extragalactic Exploration (MIGHTEE) survey. At a newly measured redshift of z = 0.7092, the system has strong emission in both the 1665 MHz (L ≈ 2500 L⊙) and 1667 MHz (L ≈ 4.5 × 10…
The bar pattern speed of the Large Magellanic Cloud
Castro-Ginard, A.; Luri, X.; Chemin, L. +6 more
Context. The internal kinematics of the Large Magellanic Cloud (LMC) have been studied in unprecedented depth thanks to the excellent quality of the Gaia mission data, thus revealing the disc's non-axisymmetric structure.
Aims: We seek to constrain the LMC bar pattern speed using the astrometric and spectroscopic data from the Gaia mission. <…