Search Publications
A High-Eccentricity Warm Jupiter Orbiting TOI-4127
Gagliano, Robert; Mahadevan, Suvrath; Pepper, Joshua +37 more
We report the discovery of TOI-4127 b, which is a transiting, Jupiter-sized exoplanet on a long-period ( $P={56.39879}_{-0.00010}^{+0.00010}$ days) and a high-eccentricity orbit around a late F-type dwarf star. This warm Jupiter was first detected and identified as a promising candidate from a search for single-transit signals in TESS Sector 20 da…
Octofitter: Fast, Flexible, and Accurate Orbit Modeling to Detect Exoplanets
Crotts, Katie A.; Rice, Malena; Do Ó, Clarissa R. +11 more
As next-generation imaging instruments and interferometers search for planets closer to their stars, they must contend with increasing orbital motion and longer integration times. These compounding effects make it difficult to detect faint planets but also present an opportunity. Increased orbital motion makes it possible to move the search for pl…
The High-energy Spectrum of the Young Planet Host V1298 Tau
France, Kevin; Pineda, J. Sebastian; Duvvuri, Girish M. +4 more
V1298 Tau is a young pre-main-sequence star hosting four known exoplanets that are prime targets for transmission spectroscopy with current-generation instruments. This work pieces together observations from the NICER X-ray telescope, the Space Telescope Imaging Spectrograph and Cosmic Origins Spectrograph instruments aboard Hubble Space Telescope…
Planets Across Space and Time (PAST). IV. The Occurrence and Architecture of Kepler Planetary Systems as a Function of Kinematic Age Revealed by the LAMOST-Gaia-Kepler Sample
Dong, Subo; Zong, Weikai; Zhu, Zi +7 more
One of the fundamental questions in astronomy is how planetary systems form and evolve. Measuring the planetary occurrence and architecture as a function of time directly addresses this question. In the fourth paper of the Planets Across Space and Time series, we investigate the occurrence and architecture of Kepler planetary systems as a function…
First VLTI/GRAVITY Observations of HIP 65426 b: Evidence for a Low or Moderate Orbital Eccentricity
Lutz, D.; Genzel, R.; Sturm, E. +96 more
Giant exoplanets have been directly imaged over orders of magnitude of orbital separations, prompting theoretical and observational investigations of their formation pathways. In this paper, we present new VLTI/GRAVITY astrometric data of HIP 65426 b, a cold, giant exoplanet which is a particular challenge for most formation theories at a projecte…
Bringing 2D Eclipse Mapping out of the Shadows with Leave-one-out Cross Validation
McGill, Peter; Challener, Ryan C.; Welbanks, Luis
Eclipse mapping is a technique for inferring 2D brightness maps of transiting exoplanets from the shape of an eclipse light curve. With JWST's unmatched precision, eclipse mapping is now possible for a large number of exoplanets. However, eclipse mapping has only been applied to two planets, and the nuances of fitting eclipse maps are not yet full…
SKYSURF-4: Panchromatic Hubble Space Telescope All-Sky Surface-brightness Measurement Methods and Results
Koekemoer, Anton M.; Casertano, Stefano; Driver, Simon P. +22 more
The diffuse, unresolved sky provides most of the photons that the Hubble Space Telescope (HST) receives, yet remains poorly understood. The HST Archival Legacy program SKYSURF aims to measure the 0.2-1.6 µm sky surface brightness (sky-SB) from over 140,000 HST images. We describe a sky-SB measurement algorithm designed for SKYSURF that is ab…
Interstellar Polarization Survey. III. Relation between Optical Polarization and Reddening in the General Interstellar Medium
Magalhães, A. M.; Kawabata, Koji S.; Rodrigues, C. V. +4 more
Optical starlight can be partially polarized while propagating through the dusty, magnetized interstellar medium (ISM). The polarization efficiency describes the polarization intensity fraction per reddening unit, P V /E(B - V), related to the interstellar dust grains and magnetic field properties. The maximum value observed, [P …
The Unusual M-dwarf Warm Jupiter TOI-1899 b: Refinement of Orbital and Planetary Parameters
Cochran, William D.; Mahadevan, Suvrath; Wisniewski, John +31 more
TOI-1899 b is a rare exoplanet, a temperate warm Jupiter orbiting an M dwarf, first discovered by Cañas et al. (2020) from a TESS single-transit event. Using new radial velocities (RVs) from the precision RV spectrographs HPF and NEID, along with additional TESS photometry and ground-based transit follow-up, we are able to derive a much more preci…
Dynamical Mass of the Young Brown Dwarf Companion PZ Tel B
Bowler, Brendan P.; Franson, Kyle
Dynamical masses of giant planets and brown dwarfs are critical tools for empirically validating substellar evolutionary models and their underlying assumptions. We present a measurement of the dynamical mass and an updated orbit of PZ Tel B, a young brown dwarf companion orbiting a late-G member of the β Pic moving group. PZ Tel A exhibits an ast…