Search Publications
Oort Cloud comets discovered far from the Sun
Dones, Luke; Królikowska, Małgorzata
Context. Increasingly, Oort Cloud comets are being discovered at great distances from the Sun and tracked over ever wider ranges of heliocentric distances as observational equipment improves.
Aims: Our goal is to investigate in detail how the original semimajor axis for near-parabolic comets depends on the selected data arc and the assumed fo…
The evolution of HCO+ in molecular clouds using a novel chemical post-processing algorithm
Bigiel, F.; Barnes, A. T.; Walch, S. +4 more
Modelling the chemistry of molecular clouds is critical to accurately simulating their evolution. To reduce computational cost, 3D simulations generally restrict their chemistry to species with strong heating and cooling effects. Time-dependent information about the evolution of other species is therefore often neglected. We address this gap by po…
Trojan Asteroid Satellites, Rings, and Activity
Stern, S. Alan; Weaver, Harold A.; Buie, Marc W. +6 more
The Lucy mission will encounter five Jupiter Trojans during its mission with three of the five already known to be multiple systems. These include a near-equal-mass binary, a small and widely separated satellite, and one intermediate-size satellite system. This chapter reviews the current state of knowledge of Trojan asteroid satellites in the con…
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…