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17 papers · 2 filters
The Late-Type Extension to MoVeRS (LaTE-MoVeRS): Proper motion verified low-mass stars and brown dwarfs from SDSS, 2MASS, and WISE
Christopher A. Theissen, Andrew A. West, Guillaume Shippe +2
We present the Late-Type Extension to the Motion Verified Red Stars (LaTE-MoVeRS) catalog, containing 46,463 photometric late-type ( M5) dwarfs within the Sloan Digital Sky Surv…
Rotation Periods of Wide Binaries in the Kepler Field
K. A. Janes
In a search of proper motion catalogs for common proper motion stars in the field of the Kepler spacecraft I identified 93 likely binary systems. A comparison of their rotation per…
1.3mm polarized emission in the circumstellar disk of a massive protostar
M. Fernández-López, I. W. Stephens, J. M. Girart +5
We present the first resolved observations of the 1.3mm polarized emission from the disk-like structure surrounding the high-mass protostar Cepheus A HW2. These CARMA data partiall…
The link between solenoidal turbulence and slow star formation in G0.253+0.016
C. Federrath, J. M. Rathborne, S. N. Longmore +8
Star formation in the Galactic disc is primarily controlled by gravity, turbulence, and magnetic fields. It is not clear that this also applies to star formation near the Galactic…
M Dwarf Activity in the Pan-STARRS 1 Medium-Deep Survey: First Catalog and Rotation Periods
Erin Kado-Fong, Peter K. G. Williams, Andrew W. Mann +9
We report on an ongoing project to investigate activity in the M dwarf stellar population observed by the Pan-STARRS 1 Medium Deep Survey (PS1-MDS). Using a custom-built pipeline,…
DM Ori: A Young Star Occulted by a Disturbance in its Protoplanetary Disk
Joseph E. Rodriguez, Keivan G. Stassun, Phillip Cargile +15
In some planet formation theories, protoplanets grow gravitationally within a young star's protoplanetary disk, a signature of which may be a localized disturbance in the disk's ra…
Imaging the photoevaporating disk and radio jet of GM Aur
Enrique Macias, Guillem Anglada, Mayra Osorio +8
Photoevaporation is probably the main agent for gas dispersal during the last stages of protoplanetary disk evolution. However, the overall mass loss rate in the photoevaporative w…
A Model for (Quasi-)Periodic Multi-wavelength Photometric Variability in Young Stellar Objects
Aurora Y. Kesseli, Maya A. Petkova, Kenneth Wood +7
We present radiation transfer models of rotating young stellar objects (YSOs) with hotspots in their atmospheres, inner disk warps and other 3-D effects in the nearby circumstellar…
Using ForeCAT Deflections and Rotations to Constrain the Early Evolution of CMEs
C. Kay, M. Opher, R. C. Colaninno +1
To accurately predict the space weather effects of coronal mass ejection (CME) impacts at Earth one must know if and when a CME will impact Earth, and the CME parameters upon impac…
The physical mechanism behind M dwarf metallicity indicators and the role of C and O abundances
Mark J. Veyette, Philip S. Muirhead, Andrew W. Mann +1
We present NIR synthetic spectra based on PHOENIX stellar atmosphere models of typical early and mid M dwarfs with varied C and O abundances. We apply multiple recently published m…
The putative old, nearby cluster Lodén 1 does not exist
Eunkyu Han, Jason L. Curtis, Jason T. Wright
Astronomers have access to precious few nearby, middle-aged benchmark star clusters. Within 500 pc, there are only NGC 752 and Ruprecht 147 (R147), at 1.5 and 3 Gyr respectively. T…
Probability of CME Impact on Exoplanets Orbiting M Dwarfs and Solar-Like Stars
C. Kay, M. Opher, M. Kornbleuth
Solar coronal mass ejections (CMEs) produce adverse space weather effects at Earth. Planets in the close habitable zone of magnetically active M dwarfs may experience more extreme…
The infrared spectrograph survey of protoplanetary disks in Orion A: I. disk properties
K. H. Kim, Dan M. Watson, P. Manoj +11
We present our investigation of 319 Class II objects in Orion A observed by /IRS. We also present the follow-up observation of 120 of these Class II objects in Orion A fro…
Are IRIS bombs connected to Ellerman bombs?
Hui Tian, Zhi Xu, Jiansen He +1
Recent observations by the Interface Region Imaging Spectrograph (IRIS) have revealed pockets of hot gas (2--810 K) potentially resulting from magnetic reconnec…
Using Close White Dwarf + M Dwarf Stellar Pairs to Constrain the Flare Rates in Close Stellar Binaries
Dylan P. Morgan, Andrew A. West, Andrew C. Becker
We present a study of the statistical flare rates of M dwarfs (dMs) with close white dwarf (WD) companions (WD+dM; typical separations < 1 au). Our previous analysis demonstrated t…
Constraining the properties of transitional disks in Chamaeleon I with Herschel
Á. Ribas, H. Bouy, B. Merín +4
Transitional disks are protoplanetary disks with opacity gaps/cavities in their dust distribution, a feature that may be linked to planet formation. We perform Bayesian modeling of…
The Chemical Compositions of Very Metal-Poor Stars HD 122563 and HD 140283; A View From the Infrared
Melike Afşar, Christopher Sneden, Anna Frebel +11
From high resolution (R = 45,000), high signal-to-noise (S/N > 400) spectra gathered with the Immersion Grating Infrared Spectrograph (IGRINS) in the H and K photometric bands, we…