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Far-UV Spectroscopy of the Planet-hosting Star WASP-13: High-energy Irradiance, Distance, Age, Planetary Mass-loss Rate, and Circumstellar Environment
France, K.; Fossati, L.; Lendl, M. +3 more
Several transiting hot Jupiters orbit relatively inactive main-sequence stars. For some of those, the {log}{R}{HK}\prime activity parameter lies below the basal level (-5.1). Two explanations have been proposed so far: (i) the planet affects the stellar dynamo, (ii) the {log}{R}{HK}\prime measurements …
Observational hints of a pre-inflationary scale?
Gruppuso, A.; Sagnotti, A.
We argue that the lack of power exhibited by cosmic microwave background (CMB) anisotropies at large angular scales might be linked to the onset of inflation. We highlight observational features and theoretical hints that support this view, and present a preliminary estimate of the physical scale that would underlie the phenomenon.
The eccentric short-period orbit of the supergiant fast X-ray transient HD 74194 (=LM Vel)
Gamen, R.; Maíz Apellániz, J.; Alfaro, E. J. +5 more
Aims. We present the first orbital solution for the O-type supergiant star HD 74194, which is the optical counterpart of the supergiant fast X-ray transient IGR J08408-4503. Methods. We measured the radial velocities in the optical spectrum of HD 74194, and we determined the orbital solution for the first time. We also analysed the complex Hα prof…
Fragmentation and kinematics of dense molecular cores in the filamentary infrared-dark cloud G011.11-0.12
Henning, Thomas; Beuther, Henrik; Ragan, Sarah E. +2 more
We present new Plateau de Bure Interferometer observations of a region in the filamentary infrared-dark cloud (IRDC) G011.11-0.12 containing young, star-forming cores. In addition to the 3.2 mm continuum emission from cold dust, we map this region in the N2H+(1-0) line to trace the core kinematics with an angular resolution o…
A possible cyclotron resonance scattering feature near 0.7 keV in X1822-371
Sanna, A.; Robba, N. R.; Ferrigno, C. +9 more
Context. The source X1822-371 is a low-mass X-ray binary system (LMXB) viewed at a high inclination angle. It hosts a neutron star with a spin period of ~0.59 s, and recently, the spin period derivative was estimated to be (-2.43 ± 0.05) × 10-12 s/s.
Aims: Our aim is to address the origin of the large residuals below 0.8 keV previo…
X-Ray Emissivity of Old Stellar Populations: A Local Group Census
Jones, Christine; Wang, Q. Daniel; Kraft, Ralph P. +6 more
We study the unresolved X-ray emission in three Local Group dwarf elliptical (dE) galaxies (NGC 147, NGC 185, and NGC 205) using XMM-Newton observations; this emission most likely originates from a collection of weak X-ray sources, mainly cataclysmic variables and coronally active binaries. Precise knowledge of this stellar X-ray emission is cruci…
The composite nature of Dust-Obscured Galaxies (DOGs) at z ∼ 2-3 in the COSMOS field - I. A far-infrared view
Berta, S.; Magnelli, B.; Lutz, D. +19 more
Dust-Obscured Galaxies (DOGs) are bright 24 µm-selected sources with extreme obscuration at optical wavelengths. They are typically characterized by a rising power-law continuum of hot dust (TD ∼ 200-1000 K) in the near-IR indicating that their mid-IR luminosity is dominated by an active galactic nucleus (AGN). DOGs with a fainter…
Evidence for a pressure discontinuity at the position of the Coma relic from Planck Sunyaev-Zel'dovich effect data
Bertoldi, F.; Basu, K.; Klein, U. +2 more
Radio relics are Mpc-scale diffuse synchrotron sources found in galaxy cluster outskirts. They are believed to be associated with large-scale shocks propagating through the intracluster medium, although the connection between radio relics and the cluster merger shocks is not yet proven conclusively. We present a first tentative detection of a pres…
The Star Cluster System in the Local Group Starburst Galaxy IC 10
Lee, Myung Gyoon; Lim, Sungsoon
We present a survey of star clusters in the halo of IC 10, a starburst galaxy in the Local Group, based on Subaru R-band images and NOAO Local Group Survey UBVRI images. We find five new star clusters. All of these star clusters are located far from the center of IC 10, while previously known star clusters are mostly located in the main body. Inte…
Gemini Planet Imager Observations of the AU Microscopii Debris Disk: Asymmetries within One Arcsecond
Matthews, Brenda C.; Duchêne, Gaspard; Esposito, Thomas M. +42 more
We present Gemini Planet Imager (GPI) observations of AU Microscopii, a young M dwarf with an edge-on, dusty debris disk. Integral field spectroscopy and broadband imaging polarimetry were obtained during the commissioning of GPI. In our broadband imaging polarimetry observations, we detect the disk only in total intensity and find asymmetries in …