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Projected Rotational Velocities for LAMOST Stars with Effective Temperatures Lower than 9000 K
Luo, A. -Li; Kong, Xiao; Li, Yinbi +5 more
In Data Release 9 of LAMOST, we present measurements of v sin i for a total of 121,698 stars measured using the Medium Resolution Spectrograph (MRS) and 80,108 stars using the Low Resolution Spectrograph (LRS). These values were obtained through a χ 2 minimization process, comparing LAMOST spectra with corresponding grids of synthetical…
JWST/NIRCam Imaging of Young Stellar Objects. I. Constraints on Planets Exterior to the Spiral Disk Around MWC 758
Dong, Ruobing; Wolff, Schuyler G.; Johnstone, Doug +18 more
MWC 758 is a young star hosting a spiral protoplanetary disk. The spirals are likely companion-driven, and two previously identified candidate companions have been identified—one at the end the Southern spiral arm at ∼0.″6, and one interior to the gap at ∼0.″1. With JWST/NIRCam, we provide new images of the disk and constraints on planets exterior…
A companion in V1247 Ori supported by motion in the pattern of the spiral arm
Kraus, Stefan; Debes, John H.; Dong, Ruobing +8 more
While nearly two dozen spiral arms have been detected from planet-forming disks in near-infrared scattered light, none of their substellar drivers has been confirmed. By observing spiral systems in at least two epochs spanning multiple years and measuring the motion of the spirals, we can distinguish what causes the spirals and locate the orbits o…
Constraints on Remnant Planetary Systems as a Function of Main-sequence Mass with HST/COS
Hermes, J. J.; Redfield, Seth; Tremblay, P. -E. +8 more
As the descendants of stars with masses less than 8 M ⊙ on the main sequence, white dwarfs provide a unique way to constrain planetary occurrence around intermediate-mass stars (spectral types BAF) that are otherwise difficult to measure with radial-velocity or transit surveys. We update the analysis of more than 250 ultraviolet spectra…
The Gasing Pangkah Collaboration. I. Asteroseismic Identification and Characterization of a Rapidly Rotating Engulfment Candidate
Lewis, Geraint F.; van Saders, Jennifer; Ong, J. M. Joel +19 more
We report the discovery and characterization of TIC 350842552 ("Zvrk"), an apparently isolated, rapidly rotating (P rot ∼ 99 days) red giant observed by TESS in its southern Continuous Viewing Zone. The star's fast surface rotation is independently verified by the use of p-mode asteroseismology, strong periodicity in TESS and ASAS-SN ph…
The Sun Remains Relatively Refractory Depleted: Elemental Abundances for 17,412 Gaia RVS Solar Analogs and 50 Planet Hosts
Rampalli, Rayna; Bedell, Megan; Ness, Melissa K. +2 more
The element abundances of stars, particularly the refractory elements (e.g., Fe, Si, and Mg), play an important role in connecting stars to their planets. Most Sun-like stars do not have refractory abundance measurements since obtaining a large sample of high-resolution spectra is difficult with oversubscribed observing resources. In this work we …
The intrinsic X-ray luminosity distribution of an optically selected SDSS quasar population
Aird, James; Ruiz, Angel; Georgakakis, Antonis +1 more
In active galactic nuclei, the relationship between UV and X-ray luminosity is well studied (often characterised by αox) but often with heterogeneous samples. We have parametrized the intrinsic distribution of X-ray luminosity, LX, for the optically selected sample of SDSS quasars in the Stripe 82 and XXL fields across redshi…
Single-lined eclipsing binaries with δ Scuti components: GQ Dra, RR Lep, and TYC 683-640-1
Handler, G.; De Cat, P.; Kahraman Aliçavuş, F. +2 more
Eclipsing binaries with (a) pulsating component(s) are remarkable objects to investigate the evolution and structure of stellar systems. Detailed studies of such systems are also important to reveal their pulsation properties. The largest sample of pulsating eclipsing binaries is the one containing δ Scuti variables. In this study, we present a co…
Measuring Erosional and Depositional Patterns Across Comet 67P's Imhotep Region
Soderblom, J. M.; Hayes, A. G.; Kirk, R. L. +8 more
Comet 67P/Churyumov-Gerasimenko displays a pronounced hemispherical dichotomy in surface morphology, where the southern hemisphere exhibits more erosional features than the northern hemisphere due to receiving much greater solar radiation. Consequently, it is generally assumed that particles are ejected from the southern hemisphere through sublima…
Chemical Homogeneity of Wide Binary Systems: An Approach from Near-Infrared Spectroscopy
Lee, Young-Wook; Koch-Hansen, Andreas J.; Hong, Seungsoo +2 more
Wide binaries, with separations between the two stars from a few au to more than several thousand au, are valuable objects for various research topics in Galactic astronomy. As the number of newly reported wide binaries continues to increase, studying the chemical abundances of their component stars becomes more important. We conducted high-resolu…