Search Publications
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…
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…