626 citations · 4.7k across the 104 of their papers we have counts for
45 papers · 1 filter
NGC 1901: A new benchmark cluster for gyrochronology in the TESS Southern continuous viewing zone
Mara Bernizzoni, Timothy R. Bedding, Prasad Mani +5
We use Gaia DR3 astrometry and TESS time-series photometry to study NGC 1901, a sparse open cluster in the TESS Southern continuous viewing zone, that has been neglected due to its…
Star-Planet Interactions: Observational Techniques and Methods
P. Figueira, H. Korhonen, A. Buccino +8
This chapter summarizes the techniques and methods used to study star-planet interaction (SPI) from the observational point of view. SPI can produce a wide range of observational s…
TESS Observations of Stochastic Low-frequency Variability in Extreme Helium Stars
Courtney L. Crawford, C. Simon Jeffery, May G. Pedersen +4
Extreme helium stars (EHes) are low-mass hydrogen-deficient stars thought to be the products of double white dwarf mergers. Despite prolonged ground-based observations, there is no…
Testing Red Clump Models with the Asteroseismic Binary KIC 10841730
Lea S. Schimak, Timothy R. Bedding, Courtney L. Crawford +9
Binaries in which both stars are pulsating are rare but extremely valuable. We present the first study of an asteroseismic binary system consisting of a core helium-burning red clu…
Inferring hemispheric asymmetries of stellar active regions through the information content of astrometric signals
Conaire Deagan, Benjamin T. Montet
Photometric light curves suffer from fundamental degeneracies that limit surface information recovery. We demonstrate that astrometry enables access to complementary information th…
Looking for Companionship: Radial Velocity Follow-Up of Lithium-Rich Giants with ESPRESSO
Maryum Sayeed, Andrew R. Casey, Benjamin T. Montet +4
Lithium-rich red giants have been a long-standing mystery in stellar astrophysics. A leading theory to explain these chemically peculiar and rare objects is interactions with a clo…
The highest mass Kepler red giants -- II. Spectroscopic parameters, the amplitude-activity relation, and unexpected halo orbits
Courtney L. Crawford, Yaguang Li, Daniel Huber +11
The high-mass (M2 \Msolar{}) Kepler red giant stars are less well-studied than their lower-mass counterparts. In the previous article, we presented a sample of 48 high-mass Kepl…
The TESS Ten Thousand Catalog: 10,001 uniformly-vetted and -validated Eclipsing Binary Stars detected in Full-Frame Image data by machine learning and analyzed by citizen scientists
Veselin B. Kostov, Brian P. Powell, Aline U. Fornear +36
The Transiting Exoplanet Survey Satellite (TESS) has surveyed nearly the entire sky in Full-Frame Image mode with a time resolution of 200 seconds to 30 minutes and a temporal base…
Photometric activity cycles in fast-rotating stars: Revisiting the reality of stellar activity cycle branches
Deepak Chahal, Devika Kamath, Richard de Grijs +2
We aim to detect activity cycles in young main-sequence stars, analogous to the 11-year solar cycle, using combined photometric survey data. This research will enhance our understa…
Revisiting physical parameters of the benchmark brown dwarf LHS 6343 C through a HST/WFC3 secondary eclipse observation
William Frost, Loïc Albert, René Doyon +7
The LHS 6343 system consists of a resolved M-dwarf binary with an evolved, negligibly irradiated brown dwarf, LHS 6343 C, orbiting the primary star. Such brown dwarf eclipsing bina…
The role of carbon in red giant spectro-seismology
Kirsten A. Banks, Sarah L. Martell, C. G. Tinney +6
Although red clump stars function as reliable standard candles, their surface characteristics (i.e. , , and [Fe/H]) overlap with those of red giant branch sta…
The Gasing Pangkah Collaboration: I. Asteroseismic Identification and Characterisation of a Rapidly-Rotating Engulfment Candidate
J. M. Joel Ong, Marc Teng Yen Hon, Melinda Soares-Furtado +19
We report the discovery and characterisation of TIC 350842552 ("Zvrk"), an apparently isolated, rapidly-rotating () red giant observed by TESS in…
Identifying 850 delta Scuti pulsators in a narrow Gaia colour range with TESS 10-minute full-frame images
Amelie K. Read, Timothy R. Bedding, Prasad Mani +7
We use TESS 10-minute Full Frame Images (Sectors 27-55) to study a sample of 1708 stars within 500 pc of the Sun that lie in a narrow colour range in the centre of the delta Scuti…
Asteroseismology of the young open cluster NGC 2516 I: Photometric and spectroscopic observations
Gang Li, Conny Aerts, Timothy R. Bedding +8
Asteroseismic modelling of isolated star presents significant challenges due to the difficulty in accurately determining stellar parameters, particularly the stellar age. These cha…
A close-in giant planet escapes engulfment by its star
Marc Hon, Daniel Huber, Nicholas Z. Rui +39
When main-sequence stars expand into red giants, they are expected to engulf close-in planets. Until now, the absence of planets with short orbital periods around post-expansion, c…
Many Roads Lead to Lithium: Formation Pathways For Lithium-Rich Red Giants
Maryum Sayeed, Melissa K. Ness, Benjamin T. Montet +8
Stellar models predict that lithium (Li) inside a star is destroyed during the first dredge-up phase, yet 1.2% of red giant stars are Li-rich. We aim to uncover possible origins of…
Superflares on solar-like stars: A new method for identifying the true flare sources in photometric surveys
Valeriy Vasilyev, Timo Reinhold, Alexander I. Shapiro +5
Over the past years, thousands of stellar flares have been detected by harvesting data from large photometric surveys. These detections, however, do not account for potential sourc…
Discovery of post-mass-transfer helium-burning red giants using asteroseismology
Yaguang Li, Timothy R. Bedding, Simon J. Murphy +14
A star expands to become a red giant when it has fused all the hydrogen in its core into helium. If the star is in a binary system, its envelope can overflow onto its companion or…
A search for transits among the δ Scuti variables in Kepler
Daniel R. Hey, Benjamin T. Montet, Benjamin J. S. Pope +2
We search for transits around all known pulsating δ Sct variables (6500 K < Teff < 10 000 K) in the long-cadence Kepler data after subtracting the pulsation signal through an autom…
Evidence for Centrifugal Breakout around the Young M Dwarf TIC 234284556
Elsa K. Palumbo, Benjamin T. Montet, Adina D. Feinstein +5
Magnetospheric clouds have been proposed as explanations for depth-varying dips in the phased light curves of young, magnetically active stars such as Ori E and RIK-210. Howeve…
TIC 168789840: A Sextuply-Eclipsing Sextuple Star System
Brian P. Powell, Veselin B. Kostov, Saul A. Rappaport +48
We report the discovery of a sextuply-eclipsing sextuple star system from TESS data, TIC 168789840, also known as TYC 7037-89-1, the first known sextuple system consisting of three…
The TRENDS High-contrast Imaging Survey. VIII. Compendium of Benchmark Objects
Erica J. Gonzales, Justin R. Crepp, Eric B. Bechter +5
The physical properties of faint stellar and substellar objects often rely on indirect, model-dependent estimates. For example, the masses of brown dwarfs are usually inferred usin…
Reply to the comment of T. Metcalfe and J. van Saders on the Science report "The Sun is less active than other solar-like stars"
T. Reinhold, A. I. Shapiro, S. K. Solanki +4
This is our reply to the comment of T. Metcalfe and J. van Saders on the Science report "The Sun is less active than other solar-like stars" by T. Reinhold, A. I. Shapiro, S. K. So…
Asteroseismic masses of four evolved planet-hosting stars using SONG and TESS: resolving the retired A-star mass controversy
Sai Prathyusha Malla, Dennis Stello, Daniel Huber +12
The study of planet occurrence as a function of stellar mass is important for a better understanding of planet formation. Estimating stellar mass, especially in the red giant regim…