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NEID Reveals That the Young Warm Neptune TOI-2076 b Has a Low Obliquity
Mahadevan, Suvrath; Wisniewski, John; Wright, Jason T. +27 more
TOI-2076 b is a sub-Neptune-sized planet (R = 2.39 ± 0.10 R ⊕) that transits a young (204 ± 50 MYr) bright (V = 9.2) K-dwarf hosting a system of three transiting planets. Using spectroscopic observations obtained with the NEID spectrograph on the WIYN 3.5 m Telescope, we model the Rossiter-McLaughlin effect of TOI-2076 b, and derive a s…
Resolved Velocity Profiles of Galactic Winds at Cosmic Noon
Kacprzak, Glenn G.; Glazebrook, Karl; Tran, Kim-Vy H. +7 more
We study the kinematics of the interstellar medium (ISM) viewed "down the barrel" in 20 gravitationally lensed galaxies during cosmic noon (z = 1.5-3.5). We use moderate-resolution spectra (R ~ 4000) from Keck's Echellette Spectrograph and Imager and Magellan/MagE to spectrally resolve the ISM absorption in these galaxies into ~10 independent elem…
Identification of a Helium Donor Star in NGC 247 ULX-1
Feng, Hua; Bian, Fuyan; Zhou, Changxing
With Very Large Telescope Multi Unit Spectroscopic Explorer (MUSE) observations, we detected highly variable helium emission lines from the optical counterpart of the supersoft ultraluminous X-ray source (ULX) NGC 247 ULX-1. No Balmer lines can be seen in the source spectrum. This is the first evidence for the presence of a helium donor star in UL…
A dense mini-Neptune orbiting the bright young star HD 18599
Kane, Stephen R.; Wittenmyer, Robert A.; Horner, Jonathan +24 more
Very little is known about the young planet population because the detection of small planets orbiting young stars is obscured by the effects of stellar activity and fast rotation, which mask planets within radial velocity and transit data sets. The few planets that have been discovered in young clusters generally orbit stars too faint for any det…
The OGLE Collection of Variable Stars. Over 15 000 δ Scuti Stars in the Large Magellanic Cloud
Soszyński, I.; Udalski, A.; Szymański, M. K. +12 more
We present the OGLE collection of δ Scuti stars in the Large Magellanic Cloud and in its foreground. Our dataset encompasses a total of 15 256 objects, constituting the largest sample of extragalactic δ Sct stars published so far. In the case of 12 δ Sct pulsators, we detected additional eclipsing or ellipsoidal variations in their light curves. T…
Active Stars in the Spectroscopic Survey of Mid-to-late M Dwarfs within 15 pc
Winters, Jennifer G.; Medina, Amber A.; Irwin, Jonathan M. +2 more
We present results from the volume-complete spectroscopic survey of 0.1-0.3 M ⊙ M dwarfs within 15 pc. This work discusses the active sample without close binary companions, providing a comprehensive picture of these 123 stars with Hα emission stronger than -1 Å. Our analysis includes rotation periods (including 31 new measurements), Hα…
Discovery of a resolved white dwarf-brown dwarf binary with a small projected separation: SDSS J222551.65+001637.7AB
Debes, John H.; Manjavacas, Elena; Dupuy, Trent J. +4 more
We present the confirmation of SDSS J222551.65+001637.7AB as a closely separated, resolved, white dwarf-brown dwarf binary. We have obtained spectroscopy from GNIRS and seeing-limited Ks-band imaging from NIRI on Gemini North. The target is spatially resolved into its constituent components: a 10926 ± 246 K white dwarf, with log g = 8.2…
SRG/eROSITA and XMM-Newton observations of Vela Jr
Sasaki, Manami; Becker, Werner; Freyberg, Michael +4 more
Context. The Vela supernova remnant (SNR) complex is a region containing at least three SNRs: Vela, Puppis A, and Vela Jr. With the launch of the spectro-imaging X-ray telescope eROSITA on board the Spectrum-Röntgen-Gamma (SRG) mission, it became possible to observe the one degree wide Vela Jr in its entirety. Although several previous pointed Cha…
Gaia search for early-formed andesitic asteroidal crusts
Galluccio, L.; Delbo, M.; Avdellidou, C. +2 more
Context. Andesitic meteorites are among the oldest achondrites known to date. They record volcanic events and crust formation episodes in primordial planetesimals that took place about 4.565 Myr ago. However, no analogue for these meteorites has been found in the asteroid population to date.
Aims: We searched for spectroscopic analogues of th…
Detection of Dust in High-velocity Cloud Complex C-Enriched Gas Accreting onto the Milky Way
Richter, Philipp; Kriss, Gerard A.; Fox, Andrew J. +4 more
We present the detection of dust depletion in Complex C, a massive, infalling, low-metallicity high-velocity cloud in the northern Galactic hemisphere that traces the ongoing accretion of gas onto the Milky Way. We analyze a very high signal-to-noise Hubble Space Telescope Cosmic Origins Spectrograph spectrum of active galactic nucleus (AGN) Mrk 8…