Search Publications
TESS Hunt for Young and Maturing Exoplanets (THYME). VII. Membership, Rotation, and Lithium in the Young Cluster Group-X and a New Young Exoplanet
Vanderburg, Andrew; Rampalli, Rayna; Bieryla, Allyson +36 more
The public, all-sky surveys Gaia and TESS provide the ability to identify new young associations and determine their ages. These associations enable study of planetary evolution by providing new opportunities to discover young exoplanets. A young association was recently identified by Tang et al. and Fürnkranz et al. using astrometry from Gaia (ca…
Confirmation of Water Absorption in the Thermal Emission Spectrum of the Hot Jupiter WASP-77Ab with HST/WFC3
Fortney, Jonathan J.; Stevenson, Kevin B.; Désert, Jean-Michel +11 more
Secondary eclipse observations of hot Jupiters can reveal both their compositions and thermal structures. Previous observations have shown a diversity of hot Jupiter eclipse spectra, including absorption features, emission features, and featureless blackbody-like spectra. We present a secondary eclipse spectrum of the hot Jupiter WASP-77Ab observe…
Complex Modulation of Rapidly Rotating Young M Dwarfs: Adding Pieces to the Puzzle
Jayaraman, Rahul; Kristiansen, Martti H.; Triaud, Amaury H. M. J. +37 more
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 rotators). All are part of star-forming associations, are distinct from other variable stars, and likely belong to a unified class. Suggested hypotheses include starspo…
New Insights into the Structure of Open Clusters in the Gaia Era
Chen, Li; Zhong, Jing; Hou, Jinliang +2 more
With the help of Gaia data, it is noted that in addition to the core components, there are low-density outer halo components in the extended region of open clusters. In order to study the extended structure beyond the core radius of the cluster (~10 pc), based on Gaia Early Data Release 3, taking up to 50 pc as the searching radius, we use the pyU…
Elemental Abundances of nearby M Dwarfs Based on High-resolution Near-infrared Spectra Obtained by the Subaru/IRD Survey: Proof of Concept
Henning, Thomas; Nakagawa, Takao; Currie, Thayne +24 more
Detailed chemical analyses of M dwarfs are scarce but necessary to constrain the formation environment and internal structure of planets being found around them. We present elemental abundances of 13 M dwarfs (2900 < T eff < 3500 K) observed in the Subaru/IRD planet search project. They are mid- to late-M dwarfs whose abundance of…
Mass Production of 2021 KMTNet Microlensing Planets. I
Han, Cheongho; Lee, Chung-Uk; Zang, Weicheng +17 more
We inaugurate a program of "mass production" of microlensing planets discovered in 2021 KMTNet data, with the aim of laying the basis for future statistical studies. While we ultimately plan to quickly publish all 2021 planets meeting some minimal criteria, the current sample of four was chosen simply on the basis of having low initial estimates o…
wdwarfdate: A Python Package to Derive Bayesian Ages of White Dwarfs
Angus, Ruth; Kiman, Rocio; Xu, Siyi +5 more
White dwarfs have been successfully used as cosmochronometers in the literature; however, their reach has been limited in comparison to their potential. We present wdwarfdate, a publicly available Python package to derive the Bayesian age of a white dwarf, based on its effective temperature (T eff) and surface gravity (log g). We make t…
New Photometric Calibration of the Wide Field Camera 3 Detectors
Mack, Jennifer; Calamida, Annalisa; Medina, Jennifer +6 more
We present a new photometric calibration of the WFC3-UVIS and WFC3-IR detectors based on observations collected from 2009 to 2020 for four white dwarfs-namely, GRW +70 5824, GD 153 , GD 71 , G191B2B-and a G-type star, P330E. These calibrations include recent updates to the Hubble Space Telescope primary standard white dwarf models and a new refere…
A 38 Million Year Old Neptune-sized Planet in the Kepler Field
Tamura, M.; Narita, N.; Bouma, L. G. +12 more
Kepler 1627A is a G8V star previously known to host a 3.8 R ⊕ planet on a 7.2 day orbit. The star was observed by the Kepler space telescope because it is nearby (d = 329 pc) and it resembles the Sun. Here, we show using Gaia kinematics, TESS stellar rotation periods, and spectroscopic lithium abundances that Kepler 1627 is a member of …
India's First Robotic Eye for Time-domain Astrophysics: The GROWTH-India Telescope
Angchuk, Dorje; De, Kishalay; Fremling, Christoffer +35 more
We present the design and performance of the GROWTH-India telescope, a 0.7 m robotic telescope dedicated to time-domain astronomy. The telescope is equipped with a 4k back-illuminated camera that gives a 0.°82 field of view and a sensitivity of m g' ~ 20.5 in 5 minute exposures. Custom software handles observatory operations: attaining …