Search Publications
Revision of Stellar Intrinsic Colors in the Infrared by Spectroscopic Surveys
Jiang, Biwei; Zhao, He; Gao, Shuang +1 more
Intrinsic colors of normal stars are derived in the popularly used infrared bands involving the Two Micron All-Sky Survey/JHKS, Wide-field Infrared Survey Explorer, Spitzer/IRAC, and AKARI/S9W filters. Based on three spectroscopic surveys—LAMOST, RAVE, and APOGEE, stars are classified into groups of giants and dwarfs, as well as metal-n…
Geomorphology of comet 67P/Churyumov-Gerasimenko
Soderblom, J. M.; Sierks, H.; Vincent, J. -B. +10 more
We present a global geomorphological map of comet 67P/Churyumov-Gerasimenko (67P/C-G) using data acquired by the Rosetta Orbiter's OSIRIS Narrow Angle Camera. The images used in our study were acquired between 2014 August and 2015 May, before 67P/C-G passed through perihelion. Imagery of the Southern hemisphere was included in our study, allowing …
Quasilinear analysis of saturation properties of broadband whistler mode waves
Chen, L.; Liu, X.; Wang, S. +2 more
Saturation properties of parallel propagating broadband whistler mode waves are investigated using quasilinear theory. By assuming that the electron distribution stays bi-Maxwellian, we combine the previously obtained energy equation of quasilinear theory with wave equation to self-consistently model the excitation of broadband whistler waves. The…
The Hard X-Ray Emission of the Blazar PKS 2155-304
Misra, R.; Dewangan, G. C.; Gaur, Haritma +4 more
The synchrotron peak of the X-ray bright High Energy Peaked Blazar PKS 2155-304 occurs in the UV-EUV region and hence its X-ray emission (0.6-10 keV) lies mostly in the falling part of the synchrotron hump. We aim to study the X-ray emission of PKS 2155-304 during different intensity states in 2009-2014 using the XMM-Newton satellite. We studied t…
Herschel survey and modelling of externally-illuminated photoevaporating protoplanetary disks
Kamp, I.; Le Petit, F.; Goicoechea, J. R. +5 more
Context. Protoplanetary disks undergo substantial mass-loss by photoevaporation, a mechanism that is crucial to their dynamical evolution. However, the processes regulating the gas energetics have not so far been well constrained by observations.
Aims: We aim to study the processes involved in disk photoevaporation when it is driven by far-UV…
Deep HST Imaging in 47 Tucanae: A Global Dynamical Model
Anderson, J.; Heyl, J.; Kalirai, J. +3 more
Multi-epoch observations with the Advanced Camera Survey and WFC3 on the Hubble Space Telescope provide a unique and comprehensive probe of stellar dynamics within 47 Tucanae. We confront analytic models of the globular cluster with the observed stellar proper motions that probe along the main sequence from just above 0.8-0.1M ⊙ as well…
Stellar laboratories . VIII. New Zr iv-vii, Xe iv-v, and Xe vii oscillator strengths and the Al, Zr, and Xe abundances in the hot white dwarfs G191-B2B and RE 0503-289
Hoyer, D.; Rauch, T.; Werner, K. +5 more
Context. For the spectral analysis of high-resolution and high-signal-to-noise spectra of hot stars, state-of-the-art non-local thermodynamic equilibrium (NLTE) model atmospheres are mandatory. These are strongly dependent on the reliability of the atomic data that is used for their calculation.
Aims: To search for zirconium and xenon lines i…
The abundance of compact quiescent galaxies since z ∼ 0.6
Erben, Thomas; Hildebrandt, Hendrik; Huertas-Company, Marc +12 more
We set out to quantify the number density of quiescent massive compact galaxies at intermediate redshifts. We determine structural parameters based on I-band imaging using the Canada-France-Hawaii Telescope (CFHT) equatorial Sloan Digital Sky Survey (SDSS) Stripe 82 (CS82) survey (∼170 deg2) taking advantage of an exquisite median seein…
A search for tight hierarchical triple systems amongst the eclipsing binaries in the CoRoT fields
Klagyivik, P.; Borkovits, T.; Benkő, J. M. +5 more
We report a comprehensive search for hierarchical triple stellar system candidates amongst eclipsing binaries (EBs) observed by the CoRoT spacecraft. We calculate and check eclipse timing variation (ETV) diagrams for almost 1500 EBs in an automated manner. We identify five relatively short period Algol systems for which our combined light-curve an…
The Class 0 Protostar BHR71: Herschel Observations and Dust Continuum Models
Dunham, Michael M.; Green, Joel D.; Yang, Yao-Lun +2 more
We use Herschel spectrophotometry of BHR71, an embedded Class 0 protostar, to provide new constraints on its physical properties. We detect 645 (non-unique) spectral lines among all spatial pixels. At least 61 different spectral lines originate from the central region. A CO rotational diagram analysis shows four excitation temperature components, …