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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…
Conspicuous Gas, Cryptic Dust: Spectroscopy and Chromaticity of Complex Periodic Variables
Luke G. Bouma, Facundo Perez Paolino, Lynne A. Hillenbrand +17
Complex periodic variables (CPVs) are young low-mass stars whose light curves show periodic dips indicative of transiting corotating material. The origin and composition of this ma…
The TESS All-Sky Rotation Survey: Periods for 1,046,317 Stars Within 500 pc
Andrew W. Boyle, Luke G. Bouma, Andrew W. Mann
Stellar rotation is a fundamental tracer of stellar magnetic evolution, age, and activity, with broad implications for Galactic archaeology and exoplanet characterization. The Tran…
Dust cloud lifetimes of Scallop-shell stars
Simon Daley-Yates, Moira M. Jardine, Luke Bouma
We investigate the survival of dust trapped in magnetically confined cool gas clouds (or {\it prominences}) around rapidly rotating M-dwarfs exhibiting the ``scallop-shell'' light-…
Lost Sisters Found: TESS and Gaia Reveal a Dissolving Pleiades Complex
Andrew W. Boyle, Luke G. Bouma, Andrew W. Mann
Most star clusters dissolve into the Galaxy over tens to hundreds of millions of years after they form. While recent Gaia studies have honed our view of cluster dispersal, the exac…
Polarized, variable radio emission from the scallop-shell binary system DG CVn
Simranpreet Kaur, Daniele Viganò, Jackie Villadsen +9
DG CVn is an eruptive variable star and represents the closest member of the known sample of complex periodic variables, or scallop-shell stars. Over the years, this M dwarf binary…
A Plasma Torus Around a Young Low-Mass Star
Luke G. Bouma, Moira M. Jardine
A small fraction of red dwarfs younger than 100 million years show structured, periodic optical light curves suggestive of transiting opaque material that corotates with the star.…
The T16 Project: Image Subtraction Light Curves from TESS Cycle 1 Full-Frame Images for Stars with T < 16
Joel Hartman, Gáspár Bakos, Luke G. Bouma +1
We present 83,717,159 light curves for 56,401,549 stars with T < 16 mag observed in the Full-Frame Images (FFIs) of Cycle 1 of the NASA TESS mission. These light curves were extrac…
Ages of Stars and Planets in the Kepler Field Younger Than Four Billion Years
Luke G. Bouma, Lynne A. Hillenbrand, Andrew W. Howard +3
Recent analyses of FGK stars in open clusters have helped clarify the precision with which a star's rotation rate and lithium content can be used as empirical indicators for its ag…
Confirming the Tidal Tails of the Young Open Cluster Blanco 1 with TESS Rotation Periods
Lizhou Sha, Andrew M. Vanderburg, Luke G. Bouma +1
Blanco 1 is an open cluster located 240 pc from the Sun below the Galactic plane. Recent studies have reported the existence of diffuse tidal tails exte…
SPYGLASS. V. Spatially and Temporally Structured Star-Forming Environments in the Cepheus-Hercules Complex
Ronan Kerr, Adam L. Kraus, Daniel Krolikowski +2
Young associations record complete histories of star forming events through their demographics and dynamics, and Gaia has greatly expanded our knowledge of these associations. We p…
The California Legacy Survey V. Chromospheric Activity Cycles in Main Sequence Stars
Howard Isaacson, Andrew W. Howard, Benjamin Fulton +31
We present optical spectroscopy of 710 solar neighborhood stars collected over twenty years to catalog chromospheric activity and search for stellar activity cycles. The California…
Transient Corotating Clumps Around Adolescent Low-Mass Stars From Four Years of TESS
Luke G. Bouma, Rahul Jayaraman, Saul Rappaport +5
Complex periodic variables (CPVs) are stars that exhibit highly structured and periodic optical light curves. Previous studies have indicated that these stars are typically disk-fr…
The Empirical Limits of Gyrochronology
Luke G. Bouma, Elsa K. Palumbo, Lynne A. Hillenbrand
The promise of gyrochronology is that given a star's rotation period and mass, its age can be inferred. The reality of gyrochronology is complicated by effects other than ordinary…
TESS Hunt for Young and Maturing Exoplanets (THYME) IX: a 27 Myr extended population of Lower-Centaurus Crux with a transiting two-planet system
Mackenna L. Wood, Andrew W. Mann, Madyson G. Barber +35
We report the discovery and characterization of a nearby (~ 85 pc), older (27 +/- 3 Myr), distributed stellar population near Lower-Centaurus-Crux (LCC), initially identified by se…
A Low-Mass Pre-Main-Sequence Eclipsing Binary in Lower Centaurus Crux Discovered with TESS
Keivan G. Stassun, Guillermo Torres, Marina Kounkel +5
We report the discovery of 2M1222-57 as a low-mass, pre-main-sequence (PMS) eclipsing binary (EB) in the Lower Centaurus Crux (LCC) association for which, using Gaia parallaxes and…
Stellar Rotation and Structure of the Persei Complex: When Does Gyrochronology Start to Work?
Andrew W. Boyle, Luke G. Bouma
On the pre-main-sequence, the rotation rates of Sun-like stars are dictated by the interplay between the protostellar disk and the star's contraction. At ages exceeding 100 million…
Untangling the Galaxy. IV. Empirical Constraints on Angular Momentum Evolution and Gyrochronology for Young Stars in the Field
Marina Kounkel, Keivan G. Stassun, Luke G. Bouma +3
We present a catalog of ~100,000 periodic variable stars in TESS FFI data among members of widely distributed moving groups identified with Gaia in the previous papers in the serie…
Rotation and Lithium Confirmation of a 500 Parsec Halo for the Open Cluster NGC 2516
L. G. Bouma, J. L. Curtis, J. D. Hartman +2
Recent analyses of the Gaia data have identified diffuse stellar populations surrounding nearby open clusters. It is important to verify that these "halos", "tails", and "strings"…
Populating the brown dwarf and stellar boundary: Five stars with transiting companions near the hydrogen-burning mass limit
Nolan Grieves, François Bouchy, Monika Lendl +52
We report the discovery of five transiting companions near the hydrogen-burning mass limit in close orbits around main sequence stars originally identified by the Transiting Exopla…
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…
Discovery and Characterization of a Rare Magnetic Hybrid Cephei Slowly Pulsating B-type Star in an Eclipsing Binary in the Young Open Cluster NGC 6193
Keivan G. Stassun, Guillermo Torres, Cole Johnston +4
As many as 10\% of OB-type stars have global magnetic fields, which is surprising given their internal structure is radiative near the surface. A direct probe of internal structure…
Complex Modulation of Rapidly Rotating Young M Dwarfs: Adding Pieces to the Puzzle
Maximilian N. Günther, David A. Berardo, Elsa Ducrot +37
New sets of young M dwarfs with complex, sharp-peaked, and strictly periodic photometric modulations have recently been discovered with Kepler/K2 (scallop shells) and TESS (complex…
TIC 278956474: Two close binaries in one young quadruple system, identified by \textit{TESS}
Pamela Rowden, Tamás Borkovits, Jon M. Jenkins +25
We have identified a quadruple system with two close eclipsing binaries in TESS data. The object is unresolved in Gaia and appears as a single source at parallax 1.08~0.01 mas…