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Time Evolution Images of the Hypergiant RW Cephei during the Rebrightening Phase Following the Great Dimming
Gies, Douglas R.; Mérand, Antoine; Monnier, John D. +17 more
Stars with initial masses larger than 8 M ⊙ undergo substantial mass loss through mechanisms that remain elusive. Unraveling the origins of this mass loss is important for comprehending the evolutionary path of these stars, the type of supernova explosion, and whether they become neutron stars or black hole remnants. In 2022 December, R…
Spectroscopic variability of massive pre-main-sequence stars in M17
Kaper, L.; de Koter, A.; van Gelder, M. L. +4 more
Context. It is a challenge to study the formation process of massive stars: their formation time is short, there are only few of them, they are often deeply embedded, and they lie at relatively large distances. Our strategy is to study the outcome of the star formation process and to search for signatures that remain of the formation. We have acce…
Confronting compositional confusion through the characterization of the sub-Neptune orbiting HD 77946
Van Eylen, V.; Vanderburg, A.; Sozzetti, A. +29 more
We report on the detailed characterization of the HD 77946 planetary system. HD 77946 is an F5 (M* = 1.17 M⊙, R* = 1.31 R⊙) star, which hosts a transiting planet recently discovered by NASA's Transiting Exoplanet Survey Satellite (TESS), classified as TOI-1778 b. Using TESS photometry, high-resolution sp…
Discovery of a split stellar stream in the periphery of the Small Magellanic Cloud
Nidever, David L.
I report the discovery of a stellar stream (Sutlej) using Gaia DR3 (third data release) proper motions and XP metallicities located
The visible and thermal light curve of the large Kuiper belt object (50000) Quaoar★
Pál, A.; Molnár, L.; Marton, G. +7 more
Recent stellar occultations have allowed accurate instantaneous size and apparent shape determinations of the large Kuiper belt object (50000) Quaoar and the detection of two rings with spatially variable optical depths. In this paper we present new visible range light curve data of Quaoar from the Kepler/K2 mission, and thermal light curves at 10…
Thermal Properties of the Hot Core Population in Sagittarius B2 Deep South.
Schilke, P.; Battersby, C.; Ginsburg, A. +7 more
We report the discovery of nine new hot molecular cores in the Deep South (DS) region of Sagittarius B2 using Atacama Large Millimeter/submillimeter Array Band 6 observations. We measure the rotational temperature of CH3OH and derive the physical conditions present within these cores and the hot core Sgr B2(S). The cores show heterogene…
Shadowing in the Protoplanetary Disk of ZZ Tau IRS with HST
Dong, Ruobing; Liu, Hauyu Baobab; Hashimoto, Jun +2 more
An inner component misaligned from an outer component in a protoplanetary disk can result in the former casting shadows on the latter. We present a new instance of shadowing on the outer disk around a very-low-mass star, ZZ Tau IRS. Through the analysis of near-infrared (NIR) archival data at λ = 1.6 µm acquired with the Wide Field Camera 3 …
FitteR for Accretion ProPErties of T Tauri stars (FRAPPE): A new approach to use class III spectra to derive stellar and accretion properties
Alcalá, J. M.; Natta, A.; Manara, C. F. +10 more
Context. Studies of the stellar and accretion properties of classical T Tauri stars (CTTS) require photospheric spectral templates to be compared with. The use of low-activity, slowly rotating field dwarfs or model spectra can be advantageous for the determination of stellar parameters, but it can lead to an overestimate of the mass accretion rate…
Searching for new cataclysmic variables in the Chandra Source Catalog
Riddle, Reed; Szkody, Paula; El-Badry, Kareem +14 more
Aims. Cataclysmic variables (CVs) are compact binary systems in which a white dwarf accretes matter from a Roche-lobe-filling companion star. For this study we searched for new CVs in the Milky Way in the Chandra Source Catalog v2.0, cross-matched with Gaia Data Release 3 (DR3). Methods. We identified new CV candidates by combining X-ray and optic…
The astrophysical parameters of chemically peculiar stars from automatic methods
Paunzen, E.
Context. The chemically peculiar (CP) stars of the upper main sequence are excellent astrophysical laboratories for investigating the diffusion, mass loss, rotational mixing, and pulsation in the presence and absence of a stable local magnetic field. For this, we need a homogeneous set of parameters, such as effective temperature (Teff)…