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The impact of turbulent vertical mixing in the Venus clouds on chemical tracers
Marcq, Emmanuel; Lefèvre, Franck; Lefèvre, Maxence
Venus' clouds host a convective layer between roughly 50 and 60 km that mixes heat, momentum, and chemical species. Observations and numerical modelling have helped to understand the complexity of this region. However, the impact on chemistry is still not known. Here, we use for the first time a three-dimensional convection-resolving model with pa…
Kinematics of luminous blue variables in the Large Magellanic Cloud
Choi, Yumi; Smith, Nathan; Andrews, Jennifer +3 more
We study the kinematics of luminous blue variables (LBVs) in the Large Magellanic Cloud (LMC). Using high-resolution spectra, we measure the systemic radial velocities for a sample of 16 LBVs and LBV candidates. In order to measure the net motion of LBVs compared to their local environments, we subtract the projected line-of-sight velocity at the …
Searching for a Solar Source of Magnetic-Field Switchbacks in Parker Solar Probe's First Encounter
Mandrini, C. H.; Raouafi, N. E.; Velli, M. +9 more
Parker Solar Probe observations show ubiquitous magnetic-field reversals closer to the Sun, often referred to as "switchbacks". The switchbacks have been observed before in the solar wind near 1 AU and beyond, but their occurrence was historically rare. PSP measurements below ∼ 0.2 AU show that switchbacks are, however, the most prominent structur…
Discovery of 34 Low-mass Comoving Systems Using NOIRLab Source Catalog DR2
Kiman, Rocio; Kirkpatrick, J. Davy; Burgasser, Adam J. +12 more
We present the discovery of 34 comoving systems containing an ultracool dwarf found by means of the NOIRLab Source Catalog (NSC) DR2. NSC's angular resolution of ~ 1″ allows for the detection of small separation binaries with significant proper motions. We used the catalog's accurate proper motion measurements to identify the companions by cross-m…
A detailed study of stellar populations of three star clusters with extended main-sequence turnoffs
Li, Zhongmu; Chen, Jing; Zhang, Su +2 more
This paper investigates the extended main-sequence turnoffs (eMSTOs) and stellar populations of three clusters with different ages using Gaia Data Release 2 (DR2) data in detail. The colour-magnitude diagrams (CMDs) of three Galactic clusters show broad main sequences, eMSTOs, blue stragglers, and red giant clumps. We explore the effects of age sp…
Characterization of the HD 108236 system with CHEOPS and TESS Confirmation of a fifth transiting planet
Alonso, R.; Deleuil, M.; Erikson, A. +87 more
Context. The HD 108236 system was first announced with the detection of four small planets based on TESS data. Shortly after, the transit of an additional planet with a period of 29.54 d was serendipitously detected by CHEOPS. In this way, HD 108236 (V = 9.2) became one of the brightest stars known to host five small transiting planets (Rp
Topographically Influenced Evolution of Large-scale Changes in Comet 67P/Churyumov-Gerasimenko's Imhotep Region
Soderblom, Jason M.; Bodewits, Dennis; Vincent, Jean-Baptiste +5 more
Large portions of comet 67P/Churyumov-Gerasimenko's northern hemisphere are blanketed by fallback material consisting of centimeter-sized particles termed the smooth terrains. Observations from the Rosetta mission show that the most drastic transient changes during 67P's 2015 perihelion passage occurred within a subset of these deposits. However, …
Multiple giant eruptions and X-ray emission in the recoiling AGN/LBV candidate SDSS1133
Kokubo, Mitsuru
We present a comprehensive analysis of 20 yr worth of multicolour photometric light curves, multiepoch optical spectra, and X-ray data of an off-nuclear variable object SDSS1133 in Mrk 177 at z = 0.0079. The UV-optical light curves reveal that SDSS1133 experienced four outbursts in 2001, 2014, 2019, and 2021. The persistent UV-optical luminosity i…
Distributed YSOs in the Perseus Molecular Cloud from the Gaia and LAMOST Surveys
Fang, Min; Herczeg, Gregory J.; Gao, Yu +5 more
Identifying the young optically visible population in a star-forming region is essential for fully understanding the star formation event. In this paper, we identify 211 candidate members of the Perseus molecular cloud based on Gaia astrometry. We use LAMOST spectra to confirm that 51 of these candidates are new members, bringing the total census …
XMM-Newton and SRG/eROSITA observations of the isolated neutron star candidate 4XMM J022141.5−735632
Haberl, F.; Moustakas, J.; Salvato, M. +11 more
We report the results of follow-up investigations of a possible new thermally emitting isolated neutron star (INS),