Search Publications
JWST MIRI MRS Observations of T Cha: Discovery of a Spatially Resolved Disk Wind
Pascucci, Ilaria; Gorti, Uma; Xie, Chengyan +8 more
Understanding when and how circumstellar disks disperse is crucial to constrain planet formation and migration. Thermal winds powered by high-energy stellar photons have long been theorized to drive disk dispersal. However, evidence for these winds is currently based only on small (∼3–6 km s‑1) blueshifts in [Ne II] 12.81 µm lines…
Spectroscopic Distance, Mass, and Age Estimations for APOGEE DR17
Brownstein, Joel R.; Stassun, Keivan G.; Holtzman, Jon A. +3 more
We derive distances and masses of stars from the Sloan Digital Sky Survey (SDSS) Apache Point Observatory Galactic Evolution Experiment Data Release 17 using simple neural networks. Training data for distances comes from Gaia EDR3, supplemented by literature distances for star clusters. For masses, the network is trained using asteroseismic masses…
The Orbital Geometries and Stellar Obliquities of Exoplanet-hosting Multistar Systems
Vanderburg, Andrew; Rice, Malena; Gerbig, Konstantin
The current orbital geometries of exoplanet systems offer a fossilized record of the systems' dynamical histories. A particularly rich set of dynamical mechanisms is available to exoplanets residing in multistar systems, which may have their evolution shaped by the gravitational influence of bound stellar companions. In this work, we examine the j…
The SDSS-V Local Volume Mapper (LVM): Scientific Motivation and Project Overview
Kumari, Nimisha; Bizyaev, Dmitry; Brownstein, Joel R. +48 more
We present the Sloan Digital Sky Survey V Local Volume Mapper (LVM). The LVM is an integral-field spectroscopic survey of the Milky Way, Magellanic Clouds, and a sample of local volume galaxies, connecting resolved parsec-scale individual sources of feedback to kiloparsec-scale ionized interstellar medium (ISM) properties. The 4 yr survey covers t…
A Two-Component Probability Distribution Function Describes the Mid-IR Emission from the Disks of Star-forming Galaxies
Sandstrom, Karin M.; Ramambason, Lise; Leroy, Adam K. +28 more
High-resolution JWST-MIRI images of nearby spiral galaxies reveal emission with complex substructures that trace dust heated both by massive young stars and the diffuse interstellar radiation field. We present high angular (0.″85) and physical resolution (20-80 pc) measurements of the probability distribution function (PDF) of mid-infrared (mid-IR…
Extended Stellar Populations in Ultrafaint Dwarf Galaxies
Vivas, A. Katherina; Martínez-Vázquez, Clara E.; Tau, Elisa A.
The possible existence of stellar halos in low-mass galaxies is being intensely discussed nowadays after some recent discoveries of stars located in the outskirts of dwarf galaxies of the Local Group. RR Lyrae stars can be used to identify the extent of these structures, taking advantage of the minimization of foreground contamination they provide…
Searching for Giant Exoplanets around M-dwarf Stars (GEMS) I: Survey Motivation
Cochran, William D.; Mahadevan, Suvrath; Teske, Johanna +13 more
Recent discoveries of transiting giant exoplanets around M-dwarf stars (GEMS), aided by the all-sky coverage of TESS, are starting to stretch theories of planet formation through the core-accretion scenario. Recent upper limits on their occurrence suggest that they decrease with lower stellar masses, with fewer GEMS around lower-mass stars compare…
Image Deconvolution and Point-spread Function Reconstruction with STARRED: A Wavelet-based Two-channel Method Optimized for Light-curve Extraction
Marshall, Philip J.; Courbin, Frédéric; Millon, Martin +2 more
We present STARRED, a point-spread function (PSF) reconstruction, two-channel deconvolution, and light-curve extraction method designed for high-precision photometric measurements in imaging time series. An improved resolution of the data is targeted rather than an infinite one, thereby minimizing deconvolution artifacts. In addition, STARRED perf…
Keck and Hubble Observations Show that MOA-2008-BLG-379Lb is a Super-Jupiter Orbiting an M Dwarf
Lu, Jessica R.; Beaulieu, Jean-Philippe; Bond, Ian A. +11 more
We present high angular resolution imaging that detects the MOA-2008-BLG-379L exoplanet host star using Keck adaptive optics and the Hubble Space Telescope. These observations reveal host star and planet masses of M host = 0.434 ± 0.065 M ⊙ and m p = 2.44 ± 0.49 M Jupiter. They are located at a distanc…
HPIC: The Habitable Worlds Observatory Preliminary Input Catalog
Tuchow, Noah W.; Stark, Christopher C.; Mamajek, Eric
The Habitable Worlds Observatory Preliminary Input Catalog (HPIC) is a list of ∼13,000 nearby bright stars that will be potential targets for the Habitable Worlds Observatory (HWO) in its search for Earth-sized planets around Sun-like stars. We construct this target list using the TESS and Gaia DR3 catalogs and develop an automated pipeline to com…