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Zodiacal Exoplanets in Time (ZEIT). VIII. A Two-planet System in Praesepe from K2 Campaign 16
Vanderburg, Andrew; Rizzuto, Aaron C.; Kraus, Adam L. +5 more
Young planets offer a direct view of the formation and evolution processes that produced the diverse population of mature exoplanet systems known today. The repurposed Kepler mission K2 is providing the first sample of young transiting planets by observing populations of stars in nearby, young clusters and stellar associations. We report the detec…
The XMM-SERVS survey: new XMM-Newton point-source catalogue for the XMM-LSS field
Smail, I.; Kelson, D. D.; Häußler, B. +28 more
We present an X-ray point-source catalogue from the XMM-Large Scale Structure (XMM-LSS) survey region, one of the XMM-Spitzer Extragalactic Representative Volume Survey (XMM-SERVS) fields. We target the XMM-LSS region with 1.3 Ms of new XMM-Newton AO-15 observations, transforming the archival X-ray coverage in this region into a 5.3 deg2
Orbital properties of binary post-AGB stars
Manick, Rajeev; Van Winckel, Hans; Kamath, Devika +5 more
Binary post-asymptotic giant branch (post-AGB) stars are thought to be the products of a strong but poorly understood interaction during the AGB phase. The aim of this contribution is to update the orbital elements of a sample of galactic post-AGB binaries observed in a long-term radial-velocity monitoring campaign by analysing these systems in a …
Ultrafast outflow in tidal disruption event ASASSN-14li
Reynolds, C. S.; Kara, E.; Kallman, T. +1 more
At only 90 Mpc, ASASSN-14li is one of the nearest tidal disruption events (TDE) ever discovered, and because of this, it has been observed by several observatories at many wavelengths. In this paper, we present new results on archival XMM-Newton observations, three of which were taken at early times (within 40 d of the discovery), and three of whi…
Jekyll & Hyde: quiescence and extreme obscuration in a pair of massive galaxies 1.5 Gyr after the Big Bang
Elbaz, D.; Pannella, M.; Papovich, C. +12 more
We obtained ALMA spectroscopy and deep imaging to investigate the origin of the unexpected sub-millimeter emission toward the most distant quiescent galaxy known to date, ZF-COSMOS-20115 at z = 3.717. We show here that this sub-millimeter emission is produced by another massive (M* 1011 M⊙), compact (r1/2
Detection of Additional Be+sdO Systems from IUE Spectroscopy
Gies, Douglas R.; Wang, Luqian; Peters, Geraldine J.
There is growing evidence that some Be stars were spun up through mass transfer in a close binary system, leaving the former mass donor star as a hot, stripped-down object. There are five known cases of Be stars with hot subdwarf (sdO) companions that were discovered through International Ultraviolet Explorer (IUE) spectroscopy. Here we expand the…
An HST/WFC3 Thermal Emission Spectrum of the Hot Jupiter HAT-P-7b
Fortney, Jonathan J.; Stevenson, Kevin B.; Désert, Jean-Michel +7 more
Secondary eclipse observations of several of the hottest hot Jupiters show featureless, blackbody-like spectra or molecular emission features, which are consistent with thermal inversions being present in those atmospheres. Theory predicts a transition between warmer atmospheres with thermal inversions and cooler atmospheres without inversions, bu…
Cepheid Abundances: Multiphase Results and Spatial Gradients
Luck, R. Earle
Parameters and abundances have been derived for 435 Cepheids based on an analysis of 1127 spectra. Results from five or more phases are available for 52 of the program stars. The latter set of stars span periods between 1.5 and 68 days. The parameters and abundances show excellent consistency across phase. For iron, the average range in the determ…
Extended Main-sequence Turnoff as a Common Feature of Milky Way Open Clusters
Di Criscienzo, M.; Milone, A. P.; Cordoni, G. +5 more
We present photometric analysis of 12 Galactic open clusters and show that the same multiple-population phenomenon observed in Magellanic Clouds (MCs) is present in nearby open clusters. Nearly all the clusters younger than ∼2.5 Gyr of both MCs exhibit extended main-sequence turnoffs (eMSTOs) and all the cluster younger than ∼700 Myr show broadene…
A New Generation of Cool White Dwarf Atmosphere Models. I. Theoretical Framework and Applications to DZ Stars
Dufour, P.; Allard, N. F.; Blouin, S.
The photospheres of the coolest helium-atmosphere white dwarfs are characterized by fluidlike densities. Under those conditions, standard approximations used in model atmosphere codes are no longer appropriate. Unfortunately, the majority of cool He-rich white dwarfs show no spectral features, giving us no opportunities to put more elaborate model…