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"Forbidden" stars in the eROSITA all-sky survey: X-ray emission from very late-type giants
Schmitt, J. H. M. M.; Czesla, S.; Robrade, J. +4 more
We present the results of the first X-ray all-sky survey (eRASS1) performed by the eROSITA instrument aboard the Spectrum-Roentgen-Gamma (SRG) mission on X-ray emitting red giants and supergiants. Focusing on stars positioned at high galactic latitudes above 20°, we constructed a complete sample of such objects using the Gaia DR3 catalog and ident…
The XUV-driven escape of the planets around TOI-431 and ν2 Lupi
Fernández Fernández, Jorge; Wheatley, Peter J.; Osborn, Ares +4 more
One of the leading mechanisms invoked to explain the existence of the radius valley is atmospheric mass-loss driven by X-ray and extreme-ultraviolet irradiation, with this process stripping the primordial envelopes of young, small planets to produce the observed bimodal distribution. We present an investigation into the TOI-431 and ν2 L…
Cliff collapse on Comet 67P/Churyumov-Gerasimenko - II. Imhotep and Hathor
Davidsson, Björn J. R.
Cliff collapses on Comet 67P/Churyumov-Gerasimenko expose relatively pristine nucleus matter and offer rare opportunities to characterize ice-rich comet material. Here, Microwave Instrument for Rosetta Orbiter (MIRO) observations of two collapsed or crumbling cliffs in the Imhotep and Hathor regions have been assembled. The empirical diurnal anten…
Age Determination of LAMOST Red Giant Branch Stars Based on the Gradient Boosting Decision Tree Method
Deng, Li-Cai; Chen, Li; Spina, Lorenzo +5 more
In this study, we estimate the stellar ages of LAMOST DR8 red giant branch (RGB) stars based on the gradient boosting decision tree (GBDT) algorithm. We used 2643 RGB stars extracted from the APOKASC-2 asteroseismological catalog as the training data set. After selecting the parameters ([α/Fe], [C/Fe], T eff, [N/Fe], [C/H], log g) highl…
Multiple Emission Lines of Hα Emitters at z ∼ 2.3 from the Broad- and Medium-band Photometry in the ZFOURGE Survey
Momose, Rieko; Kodama, Tadayuki; Nakajima, Kimihiko +8 more
We present a multiple emission line study of ∼1300 Hα emitters (HAEs) at z ∼ 2.3 in the ZFOURGE survey. In contrast to the traditional spectroscopic method, our sample is selected based on the flux excess in the ZFOURGE K s broadband data relative to the best-fit stellar continuum. Using the same method, we also extract the strong dia…
Constraining Stellar Rotation at the Zero-age Main Sequence with TESS
Huang, C. X.; Wright, N. J.; Zhou, G. +5 more
The zero-age main sequence (ZAMS) is a critical phase for stellar angular momentum evolution, as stars transition from contraction-dominated spin-up to magnetic wind-dominated spin-down. We present the first robust observational constraints on rotation for FGK stars at ≈40 Myr. We have analyzed TESS light curves for 1410 members of five young open…
The Physalis system: discovery of ORC-like radio shells around a massive pair of interacting early-type galaxies with offset X-ray emission
Koribalski, Bärbel S.; Khabibullin, Ildar; Dolag, Klaus +7 more
We present the discovery of large radio shells around a massive pair of interacting galaxies and extended diffuse X-ray emission within the shells. The radio data were obtained with the Australian Square Kilometre Array Pathfinder (ASKAP) in two frequency bands centred at 944 MHz and 1.4 GHz, respectively, while the X-ray data are from the XMM-New…
The Disappearance of the Blue and Luminous Progenitor of the Type IIn SN 2010jl
Niu, Zexi; Sun, Ning-Chen; Liu, Jifeng
Type IIn supernovae (SNe) exhibit narrow hydrogen lines that arise from the strong interaction between ejecta and circumstellar material. It remains poorly understood, however, what progenitor stars give rise to these explosions. In this work, we perform a detailed analysis of the progenitor and environment of the nearby Type IIn SN 2010jl. With n…
Full orbital solutions in pre-main sequence high-order multiple systems: GG Tau Ab and UX Tau B
Duchêne, Gaspard; Ménard, François; Langlois, Maud +3 more
Context. High-order multiple (triple and beyond) systems are relatively common. Their interaction with circumstellar and circumbinary material can have a large impact on the formation and evolution of planetary systems and depends on their orbital properties.
Aims: GG Tau and UX Tau are two pre-main sequence high-order multiple systems in whi…
A Data-driven Search For Mid-infrared Excesses Among Five Million Main-sequence FGK Stars
Hogg, David W.; Contardo, Gabriella
Stellar infrared excesses can indicate various phenomena of interest, from protoplanetary disks to debris disks, or (more speculatively) techno-signatures along the lines of Dyson spheres. In this paper, we conduct a large search for "extreme" infrared excesses, designed as a data-driven contextual anomaly detection pipeline. We focus our search o…