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21 papers · 2 filters
Helioseismic Ring Analysis of CME Source Regions
S. C. Tripathy, S. de Wet, K. Jain +2
We apply the ring diagram technique to source regions of halo coronal mass ejections (CMEs) to study changes in acoustic mode parameters before, during, and after the onset of CMEs…
XO-3b: A Massive Planet in an Eccentric Orbit Transiting an F5V Star
Christopher M. Johns-Krull, Peter R. McCullough, Christopher J. Burke +13
We report the discovery of a massive (Mpsini = 13.02 +/- 0.64 Mjup; total mass 13.25 +/- 0.64 Mjup), large (1.95 +/- 0.16 Rjup) planet in a transiting, eccentric orbit (e = 0.260 +…
Warm Molecular Gas in M51: Mapping the Excitation Temperature and Mass of H_2 with the Spitzer Infrared Spectrograph
G. Brunner, K. Sheth, L. Armus +7
We have mapped the warm molecular gas traced by the H_2 S(0) - H_2 S(5) pure rotational mid-infrared emission lines over a radial strip across the nucleus and disk of M51 (NGC 5194…
The double Subgiant Branch of NGC 1851: the role of the CNO abundance
S. Cassisi, M. Salaris, A. Pietrinferni +4
We explore the possibility that the anomalous split in the Subgiant branch of the galactic globular cluster NGC 1851 is due to the presence of two distinct stellar populations with…
Star Spot Induced Radial Velocity Variability in LkCa 19
Marcos Huerta, Christopher M. Johns-Krull, L. Prato +2
We describe a new radial velocity survey of T Tauri stars and present the first results. Our search is motivated by an interest in detecting massive young planets, as well as inves…
Characterizing the Near-UV Environment of M Dwarfs
Lucianne M. Walkowicz, Christopher M. Johns-Krull, Suzanne L. Hawley
We report the results of our HST snapshot survey with the ACS HRC PR200L prism, designed to measure the near-UV emission in a sample of nearby M dwarfs. 33 stars were observed, spa…