Search Publications
Retrieving Exoplanet Atmospheres Using Planetary Infrared Excess: Prospects for the Night Side of WASP-43 b and Other Hot Jupiters
Lustig-Yaeger, Jacob; Stevenson, Kevin B.; Mayorga, L. C. +4 more
To increase the sample size of future atmospheric characterization efforts, we build on the planetary infrared excess (PIE) technique that has been proposed as a means to detect and characterize the thermal spectra of transiting and non-transiting exoplanets using sufficiently broad wavelength coverage to uniquely constrain the stellar and planeta…
Deciphering the 3D Orion Nebula. II. A Low Ionization Region of Multiple Velocity Components Southwest of θ1 Ori C Confounds Interpretation of Low Velocity Resolution Studies of Temperature, Density, and Abundance
Abel, N. P.; O'Dell, C. R.; Ferland, G. J.
We establish that there are two velocity systems along lines of sight that contribute to the emission-line spectrum of the brightest parts of the Orion Nebula. These overlie the Orion-S embedded molecular cloud southwest of the dominant ionizing star (θ1 Ori C). Examination of 10 × 10″ samples of high spectral resolution emission-line s…
Cross-match between the Latest Swift-BAT and Fermi-LAT Catalogs
Mukherjee, Reshmi; Yoneda, Hiroki; Inoue, Yoshiyuki +4 more
We report the results of a cross-match study between the hard X-ray and GeV gamma-ray catalogs, by making use of the latest 105 month Swift-Burst Alert Telescope (BAT) and 10 yr Fermi-Large Area Telescope (LAT) catalogs, respectively. The spatial cross-matching between the two catalogs results in the matching of 132 point-like sources, including ~…
Probing the Nucleosynthetic Contribution of Low-metallicity, Low-mass Star Companions of CEMP Stars
Shejeelammal, J.; Goswami, Aruna
The observed abundance diversities among CEMP stars can shed light on the formation and evolution of elements in the early Galaxy. In this work, we present results obtained from a detailed abundance analysis of a sample of seven extrinsic carbon stars. The analysis is based on high-resolution spectra obtained with HCT/HESP (R~60,000) and SUBARU/HD…
Signature of a Massive Rotating Metal-poor Star Imprinted in the Phoenix Stellar Stream
Lewis, Geraint F.; Casey, Andrew R.; Erkal, Denis +13 more
The Phoenix stellar stream has a low intrinsic dispersion in velocity and metallicity that implies the progenitor was probably a low-mass globular cluster. In this work we use Magellan/Magellan Inamori Kyocera Echelle (MIKE) high-dispersion spectroscopy of eight Phoenix stream red giants to confirm this scenario. In particular, we find negligible …
A Search for TeV Gamma-Ray Emission from Pulsar Tails by VERITAS
Kargaltsev, Oleg; Klingler, Noel; Benbow, W. +55 more
We report on the search for very-high-energy gamma-ray emission from the regions around three nearby supersonic pulsars (PSR B0355+54, PSR J0357+3205, and PSR J1740+1000) that exhibit long X-ray tails. To date there is no clear detection of TeV emission from any pulsar tail that is prominent in X-ray or radio. We provide upper limits on the TeV fl…
Variability of Disk Emission in Pre-main Sequence and Related Stars. V. Occultation Events from the Innermost Disk Region of the Herbig Ae Star HD 163296
Bayyari, Ammar; Sitko, Michael L.; Grady, Carol A. +8 more
HD 163296 is a Herbig Ae star that underwent a dramatic ~0.8 magnitude drop in brightness in the V photometric band in 2001 and a brightening in the near-IR in 2002. Because the star possesses Herbig-Haro objects traveling in outflowing bipolar jets, it was suggested that the drop in brightness was due to a clump of dust entrained in a disk wind, …
A Deep Search for Five Molecules in the 49 Ceti Debris Disk
Hughes, A. Meredith; Roberge, Aki; Moór, Attila +9 more
Surprisingly strong CO emission has been observed from more than a dozen debris disks around nearby main-sequence stars. The origin of this CO is unclear, in particular whether it is left over from the protoplanetary disk phase or is second-generation material released from collisions between icy bodies like debris dust. The primary unexplored ave…
The IGRINS YSO Survey II: Veiling Spectra of Pre-main-sequence Stars in Taurus-Auriga
Tofflemire, Benjamin M.; López-Valdivia, Ricardo; Mace, Gregory +5 more
We present measurements of the H- and K-band veiling for 141 young stellar objects (YSOs) in the Taurus-Auriga star-forming region using high-resolution spectra from the Immersion Grating Near-Infrared Spectrometer. In addition to providing measurements of rH and rK, we produce low-resolution spectra of the excess emission ac…
[C II] and CO Emission along the Bar and Counter-arms of NGC 7479
Laine, Seppo; Fadda, Dario; Appleton, Philip N.
We present new SOFIA [C II] and ALMA COJ=1→0 observations of the nearby asymmetric barred spiral galaxy NGC 7479. The data, which cover the whole bar of the galaxy and the counter-arms visible in the radio continuum, are analyzed in conjunction with a wealth of existing visible, infrared, radio, and X-ray data. As in most normal galaxie…