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A Spitzer Space Telescope Exploration Science Program to Search for Y Dwarf Variability
Michael C. Cushing, Jesica L. Trucks, Kevin K. Hardegree-Ullman +10
We present the results of a Spitzer Space Telescope Exploration Science Program to search for and characterize variability in Y dwarfs. We observed 14 Y dwarfs over a 24 hr period…
Scaling K2. I. Revised Parameters for 222,088 K2 Stars and a K2 Planet Radius Valley at 1.9
Kevin K. Hardegree-Ullman, Jon K. Zink, Jessie L. Christiansen +3
Previous measurements of stellar properties for K2 stars in the Ecliptic Plane Input Catalog (EPIC; Huber et al. 2016) largely relied on photometry and proper motion measurements,…
Characterizing K2 Candidate Planetary Systems Orbiting Low-Mass Stars IV: Updated Properties for 86 Cool Dwarfs Observed During Campaigns 1-17
Courtney D. Dressing, Kevin Hardegree-Ullman, Joshua E. Schlieder +15
We present revised stellar properties for 172 K2 target stars that were identified as possible hosts of transiting planets during Campaigns 1-17. Using medium-resolution near-infra…
Spitzer Light Curves of the Young, Planetary-Mass TW Hya Members 2MASS J11193254-1137466AB and WISEA J114724.10-204021.3
Adam C. Schneider, Kevin K. Hardegree-Ullman, Michael C. Cushing +2
We present Spitzer Space Telescope time-series photometry at 3.6 and 4.5 m of 2MASS J111932541137466AB and WISEA J114724.10204021.3, two planetary-mass, late-type (L…
2MASS J11151597+1937266: A Young, Dusty, Isolated, Planetary-Mass Object with a Potential Wide Stellar Companion
Christopher A. Theissen, Adam J. Burgasser, Daniella C. Bardalez Gagliuffi +4
We present 2MASS J11151597+1937266, a recently identified low-surface gravity L dwarf, classified as an L2 based on Sloan Digital Sky Survey optical spectroscopy. We confirm thi…
A Spectroscopic Orbit for the late-type Be star CMi
Nick Dulaney, Noel D. Richardson, Cody J. Gerhartz +12
The late-type Be star CMi is remarkably stable compared to other Be stars that have been studied. This has led to a realistic model of the outflowing Be disk by Klement et al.…
Photometric Monitoring of the Coldest Known Brown Dwarf with the Spitzer Space Telescope
Taran Esplin, Kevin Luhman, Michael Cushing +4
Because WISE J085510.83071442.5 (hereafter WISE 0855-0714) is the coldest known brown dwarf ( K) and one of the Sun's closest neighbors (2.2 pc), it offers a unique opp…
Observed Variability at 1um and 4um in the Y0 Brown Dwarf WISEP J173835.52+273258.9
S. K. Leggett, Michael C. Cushing, Kevin K. Hardegree-Ullman +10
We have monitored photometrically the Y0 brown dwarf WISEP J173835.52+273258.9 (W1738) at both near- and mid-infrared wavelengths. This ~1 Gyr-old 400K dwarf is at a distance of 8p…
The First Detection of Photometric Variability in a Y Dwarf: WISE J140518.39+553421.3
Michael C. Cushing, Kevin K. Hardegree-Ullman, Jesica L. Trucks +8
We present the first detection of photometric variability of a spectroscopically-confirmed Y dwarf. The Infrared Array Camera on board the Spitzer Space Telescope was used to obtai…