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HATS-38 b and WASP-139 b Join a Growing Group of Hot Neptunes on Polar Orbits
Jordán, Andrés; Brahm, Rafael; Boyle, Gavin +9 more
We constrain the sky-projected obliquities of two low-density hot Neptune planets, HATS-38 b and WASP-139 b, orbiting nearby G and K stars using Rossiter–McLaughlin (RM) observations with VLT/ESPRESSO, yielding
CORINOS. II. JWST-MIRI Detection of Warm Molecular Gas from an Embedded, Disk-bearing Protostar
Bergner, Jennifer B.; van Dishoeck, Ewine F.; Evans, Neal J. +8 more
We present James Webb Space Telescope (JWST) Mid-InfraRed Instrument (MIRI) observations of warm CO and H2O gas in emission toward the low-mass protostar IRAS 15398-3359, observed as part of the CORINOS program. The CO is detected via the rovibrational fundamental band and hot band near 5 µm, whereas the H2O is detected…
A new catalog of magnetically active solar-like oscillators
Corsaro, E.; Giovannelli, L.; Di Mauro, M. P. +3 more
We present a new catalog of stars for which detected solar-like oscillations and magnetic activity measurements from chromospheric spectroscopic observations are both available. Our results were obtained by exploiting NASA TESS mission light curves for active stars observed within the Mount Wilson Observatory HK project and the HK survey of the Ha…
cecilia: a machine learning-based pipeline for measuring metal abundances of helium-rich polluted white dwarfs
Vanderburg, Andrew; Badenas-Agusti, Mariona; Blouin, Simon +4 more
Over the past several decades, conventional spectral analysis techniques of polluted white dwarfs have become powerful tools to learn about the geology and chemistry of extrasolar bodies. Despite their proven capabilities and extensive legacy of scientific discoveries, these techniques are, however, still limited by their manual, time-intensive, a…
The surface mass density of the Milky Way: does the traditional KZ approach work in the context of new surveys?
Majewski, Steven R.; Cheng, Xinlun; Anguiano, Borja +1 more
We revisit the classical KZ problem - determination of the vertical force and implied total mass density distribution of the Milky Way disc - for a wide range of Galactocentric radius and vertical height using chemically selected thin and thick disc samples based on Apache Point Observatory Galactic Evolution Experiment spectroscopy com…
Study of the energetic X-ray superflares from the active fast rotator AB doradus
Srivastava, A. K.; Singh, Gurpreet; Pandey, Jeewan C. +1 more
We present the analyses of intense X-ray flares detected on the active fast rotator AB Dor using observations from the XMM-Newton. A total of 21 flares are detected, and 13 flares are analysed in detail. The total X-ray energy of these flares is found to be in the range of 1034-36 erg, in which the peak flare flux increased up to 34 tim…
The properties of RR Lyrae variable stars in the Local Group dwarf galaxy LGS-3
Sarajedini, Ata
We present a sample of 56 RR Lyrae variable stars (48 ab-type and 8 c-type) measured from a set of F475W (≈B filter) and F814W (≈I filter) archival images taken with the Hubble Space Telescope/Advanced Camera for Surveys of one field in the Local Group dwarf galaxy LGS-3 (also known as the Pisces Dwarf or Pisces I). The ab-type variables exhibit a…
DEVILS/MIGHTEE/GAMA/DINGO: the impact of SFR time-scales on the SFR-radio luminosity correlation
Holwerda, Benne W.; Knowles, Kenda; Driver, Simon P. +20 more
The tight relationship between infrared luminosity (LTIR) and 1.4 GHz radio continuum luminosity ($L_\mathrm{1.4\, GHz}$) has proven useful for understanding star formation free from dust obscuration. Infrared emission in star-forming galaxies typically arises from recently formed, dust-enshrouded stars, whereas radio synchrotron emissi…
Dark lens candidates from Gaia Data Release 3
Bennett, D. P.; Soszyński, I.; Udalski, A. +48 more
Gravitational microlensing is a phenomenon that allows us to observe the dark remnants of stellar evolution, even if these bodies are no longer emitting electromagnetic radiation. In particular, it can be useful to observe solitary neutron stars or stellar-mass black holes, providing a unique window through which to understand stellar evolution. O…
Discovery of the Longest-period Classical Cepheid in the Milky Way
Soszyński, I.; Udalski, A.; Szymański, M. K. +12 more
We report the discovery of the classical Cepheid OGLE-GD-CEP-1884 (= GDS_J1535467-555656) with the longest pulsation period known in our Galaxy. The period of 78.14 days is nearly 10 days longer than that of the previous record-holding Cepheid, S Vulpeculae, and thus, OGLE-GD-CEP-1884 can be categorized as the first ultra-long-period Cepheid in th…