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A machine-learning-based tool for open cluster membership determination in Gaia DR3
Castro-Ginard, A.; Jordi, C.; Casamiquela, L. +2 more
Context. Membership studies characterising open clusters (OCs) with Gaia data - most of them using Gaia Data Release 2 (DR2) - have so far been limited at the faint end to magnitude G = 18 due to astrometric uncertainties.
Aims: Our goal is to extend current OC membership lists with faint members and to characterise the low-mass end. These lo…
Revealing AGNs through TESS variability
Holoien, Thomas W. -S.; Vallely, Patrick J.; Auchettl, Katie +7 more
We used Transiting Exoplanet Survey Satellite (TESS) data to identify 29 candidate active galactic nuclei (AGNs) through their optical variability. The high-cadence, high-precision TESS light curves present an opportunity for the identification of AGNs, including those not selected through other methods. Of the candidates, we found that 18 have ei…
TOI-969: a late-K dwarf with a hot mini-Neptune in the desert and an eccentric cold Jupiter
Deleuil, M.; Stassun, K.; Gandolfi, D. +62 more
Context. The current architecture of a given multi-planetary system is a key fingerprint of its past formation and dynamical evolution history. Long-term follow-up observations are key to complete their picture.
Aims: In this paper, we focus on the confirmation and characterization of the components of the TOI-969 planetary system, where TESS…
Cepheid metallicity in the Leavitt law (C-MetaLL) survey - III. Simultaneous derivation of the Gaia parallax offset and period-luminosity-metallicity coefficients
Ripepi, V.; Molinaro, R.; Marconi, M. +7 more
Classical Cepheids (DCEPs) are the most important standard candles in the extra-galactic distance scale thanks to the period-luminosity ($\rm PL$), period-luminosity-colour ($\rm PLC$), and period-Wesenheit ($\rm PW$) relations that hold for these objects. The advent of the Gaia mission, and in particular the Early Data Release 3 (EDR3), provided …
Angular momentum transport by magnetic fields in main-sequence stars with Gamma Doradus pulsators
Eggenberger, P.; Salmon, S. J. A. J.; Ekström, S. +2 more
Context. Asteroseismic studies show that cores of post-main-sequence stars rotate more slowly than theoretically predicted by stellar models with purely hydrodynamical transport processes. Recent studies of main-sequence stars, particularly Gamma Doradus (γ Dor) stars, have revealed the internal rotation rates for hundreds of stars, offering a cou…
The Gaia-ESO Survey: Preparing the ground for 4MOST and WEAVE galactic surveys. Chemical evolution of lithium with machine learning
Gilmore, G.; Bayo, A.; Guiglion, G. +21 more
Context. With its origin coming from several sources (Big Bang, stars, cosmic rays) and given its strong depletion during its stellar lifetime, the lithium element is of great interest as its chemical evolution in the Milky Way is not well understood at present. To help constrain stellar and galactic chemical evolution models, numerous and precise…
Coronal Heating Rate in the Slow Solar Wind
Telloni, Daniele; Zank, Gary P.; Adhikari, Laxman +59 more
This Letter reports the first observational estimate of the heating rate in the slowly expanding solar corona. The analysis exploits the simultaneous remote and local observations of the same coronal plasma volume, with the Solar Orbiter/Metis and the Parker Solar Probe instruments, respectively, and relies on the basic solar wind magnetohydrodyna…
The Fast X-Ray Transient XRT 210423 and Its Host Galaxy
Bauer, F. E.; Dhillon, V. S.; Littlefair, S. P. +8 more
Fast X-ray Transients (FXTs) are X-ray flares with durations ranging from a few hundred seconds to a few hours. Possible origins include the tidal disruption of a white dwarf by an intermediate-mass black hole, a supernova shock breakout, or a binary neutron star merger. We present the X-ray light curve and spectrum as well as deep optical imaging…
[O I] 6300 Å emission as a probe of external photoevaporation of protoplanetary discs
Henney, W. J.; Haworth, Thomas J.; Ballabio, Giulia
We study the utility of the [O I] 6300 Å forbidden line for identifying and interpreting externally driven photoevaporative winds in different environments and at a range of distances. Thermally excited [O I] 6300 Å is a well-known tracer of inner disc winds, so any external contribution needs to be distinguishable. In external winds, the line is …
Phase-space Properties and Chemistry of the Sagittarius Stellar Stream Down to the Extremely Metal-poor ([Fe/H] ≲ -3) Regime
Lee, Young Sun; Chiappini, Cristina; Limberg, Guilherme +6 more
In this work, we study the phase-space and chemical properties of the Sagittarius (Sgr) stream, the tidal tails produced by the ongoing destruction of the Sgr dwarf spheroidal (dSph) galaxy, focusing on its very metal-poor (VMP; [Fe/H] < -2) content. We combine spectroscopic and astrometric information from SEGUE and Gaia EDR3, respectively, wi…