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A Bayesian chemical evolution model of the DustPedia galaxy M74
Meneghetti, Massimo; Pozzi, Francesca; Calura, Francesco +8 more
We introduce a new, multizone chemical evolution model of the DustPedia galaxy M74, calibrated by means of Markov Chain Monte Carlo methods. We take into account the observed stellar and gas density profiles and use Bayesian analysis to constrain two fundamental parameters characterizing the gas accretion and star formation time-scale, i.e. the in…
A sub-Neptune transiting the young field star HD 18599 at 40 pc
Tamura, M.; Liu, H.; Zhang, H. +66 more
Transiting exoplanets orbiting young nearby stars are ideal laboratories for testing theories of planet formation and evolution. However, to date only a handful of stars with age <1 Gyr have been found to host transiting exoplanets. Here we present the discovery and validation of a sub-Neptune around HD 18599 , a young (300 Myr), nearby (d = 40…
HD 42477: coupled r modes, g modes, and a p mode in an A0Vnne star
Handler, G.; Lee, U.; Saio, H. +4 more
Several studies have shown that a number of stars pulsating in p modes lie between the β Cep and δ Sct instability strips in the Hertzsprung-Russell (HR) Diagram. At present, there is no certain understanding of how p modes can be excited in this Teff range. The goal of this work is to disprove the conjecture that all stars pulsating in…
On the phenomenology of magnetosheath jets with insight from theory, modelling, numerical simulations and observations by Cluster spacecraft
Voitcu, Gabriel; Echim, Marius; Munteanu, Costel +5 more
During recent years magnetosheath plasma structures called "jets" are identified in spacecraft data as localized regions in the magnetosheath where the dynamic pressure is enhanced compared to the background. Although the nomenclature and detection algorithms vary from author to author, magnetosheath jets are part of a larger class of phenomena wh…
Discovery of periodicities in two highly variable intermediate polars towards the Galactic centre
Mori, Kaya; Morris, Mark R.; Rea, Nanda +5 more
Aims: We performed a systematic analysis of X-ray point sources within 1.°5 of the Galactic centre using archival XMM-Newton data. While doing so, we discovered Fe Kα complex emission and pulsation in two highly variable sources, 4XMM J174917.7-283329 and 4XMM J174954.6-294336. In this work we report the findings of the …
Rotation and activity in late-type members of the young cluster ASCC 123
Bragaglia, A.; Frasca, A.; Alonso-Santiago, J. +1 more
ASCC 123 is a little-studied young and dispersed open cluster. Recently, we conducted the first research devoted to it. In this paper, we complement our previous work with Transiting Exoplanet Survey Satellite (TESS) photometry for the 55 likely members of the cluster. We pay special attention to seven of these high-probability members, all with F…
The largest bright ULX population in a galaxy: X-ray variability and luminosity function in the Cartwheel ring galaxy
Wolter, A.; Belfiore, A.; Salvaggio, Chiara +1 more
We analyse all the available Chandra observations of the Cartwheel galaxy and its compact group, taken between 2001 and 2008, with the main aim of addressing the variability in the X-ray band for this spectacular collisional ring galaxy. We focus on the study of point-like sources, in particular we are interested in ultraluminous X-ray sources (UL…
Absolute Properties of the Oscillating Eclipsing Algol X Trianguli
Kim, Dong-Jin; Wolf, Marek; Hong, Kyeongsoo +2 more
We report results from the TESS photometric data and new high-resolution spectra of the Algol system X Tri showing short-period pulsations. From the echelle spectra, the radial velocities of the eclipsing pair were measured, and the rotational rate and effective temperature of the primary star were obtained to be v 1sini = 84 ± 6 km s
HOPS 361-C's Jet Decelerating and Precessing through NGC 2071 IR
Quillen, Alice C.; Rubinstein, Adam E.; Federman, Samuel +5 more
We present a two-epoch Hubble Space Telescope study of NGC 2071 IR highlighting HOPS 361-C, a protostar producing an arced 0.2 parsec-scale jet. The proper motions for the brightest knots decrease from 350 to 100 km s-1 with increasing distance from the source. The [Fe II] and Paβ emission line intensity ratio gives a velocity jump thro…
Properties and asteroseismological analysis of a new ZZ ceti discovered by TMTS
Shi, Jianrong; Filippenko, Alexei V.; Esamdin, Ali +24 more
Tsinghua University-Ma Huateng Telescope for Survey (TMTS) aims to discover rapidly evolving transients by monitoring the northern sky. The TMTS catalogue is cross-matched with the white dwarf (WD) catalogue of Gaia EDR3, and light curves of more than a thousand WD candidates are obtained so far. Among them, the WD TMTS J23450729+5813146 is one in…