Search Publications
Three hot-Jupiters on the upper edge of the mass-radius distribution: WASP-177, WASP-181, and WASP-183
Bouchy, F.; Queloz, D.; Ségransan, D. +21 more
We present the discovery of three transiting planets from the WASP survey, two hot-Jupiters: WASP-177 b (∼0.5 MJup, ∼1.6 RJup) in a 3.07-d orbit of a V = 12.6 K2 star, WASP-183 b (∼0.5 MJup, ∼1.5 RJup) in a 4.11-d orbit of a V = 12.8 G9/K0 star; and one hot-Saturn planet WASP-181 b (∼0.3 MJup,…
Multiwavelength Analysis of the Merging Galaxy Cluster A115
van Weeren, R. J.; Dawson, W. A.; Jee, M. James +4 more
A115 is a merging galaxy cluster at z ∼ 0.2 with a number of remarkable features, including a giant (∼2.5 Mpc) radio relic, two asymmetric X-ray peaks with trailing tails, and a peculiar line-of-sight velocity structure. We present a multiwavelength study of A115 using optical imaging data from Subaru, X-ray data from Chandra, and spectroscopic da…
The OTELO survey. I. Description, data reduction, and multi-wavelength catalogue
Bland-Hawthorn, Joss; Cabrera-Lavers, Antonio; Gallego, Jesús +21 more
Context. The evolution of galaxies through cosmic time is studied observationally by means of extragalactic surveys. The usefulness of these surveys is greatly improved by increasing the cosmological volume, in either depth or area, and by observing the same targets in different wavelength ranges. A multi-wavelength approach using different observ…
Compressive strength of comet 67P/Churyumov-Gerasimenko derived from Philae surface contacts
Sierks, H.; Blum, J.; Güttler, C. +8 more
Context. The landing and rebound of the Philae lander, which was part of the ESA Rosetta mission, enabled us to study the mechanical properties of the surface of comet 67P/Churyumov-Gerasimenko, because we could use Philae as an impact probe.
Aims: The aim is to approximate the descent and rebound trajectory of the Philae lander and use this …
M-subdwarf Research. I. Identification, Modified Classification System, and Sample Construction
Qin, Li; Luo, A. -Li; Zhang, Shuo +7 more
We propose a revision of the system developed by Lépine et al. for spectroscopic M-subdwarf classification. Based on an analysis of subdwarf spectra and templates from Savcheva et al., we show that the CaH1 feature originally proposed by Gizis is important in selecting reliable cool subdwarf spectra. This index should be used in combination with t…
Observational evidence of third dredge-up occurrence in S-type stars with initial masses around 1 M⊙
Jorissen, A.; Van Winckel, H.; Van Eck, S. +3 more
Context. S stars are late-type giants with spectra showing characteristic molecular bands of ZrO in addition to the TiO bands typical of M stars. Their overabundance pattern shows the signature of s-process nucleosynthesis. Intrinsic, technetium (Tc)-rich S stars are the first objects on the asymptotic giant branch (AGB) to undergo third dredge-up…
Surveying the Giant H II Regions of the Milky Way with SOFIA. I. W51A
Lim, Wanggi; De Buizer, James M.
We discuss the first results from our mid-infrared (MIR) imaging survey of Milky Way Giant H II (GH II) regions with our detailed analysis of W51A, which is one of the largest GH II regions in our Galaxy. We used the FORCAST instrument on the Stratospheric Observatory For Infrared Astronomy (SOFIA) to obtain 20 and 37 µm images of the centra…
PSR J1306-40: An X-Ray Luminous Redback with an Evolved Companion
Strader, Jay; Chomiuk, Laura; Shishkovsky, Laura +1 more
PSR J1306-40 is a millisecond pulsar (MSP) binary with a non-degenerate companion in an unusually long ∼1.097 day orbit. We present new optical photometry and spectroscopy of this system, and model these data to constrain fundamental properties of the binary such as the component masses and distance. The optical data imply a minimum neutron star m…
New constraints on Lorentz invariance violation with polarized gamma-ray bursts
Wei, Jun-Jie
Lorentz invariance violations (LIV) can yield vacuum birefringence, which results in an energy-dependent rotation of the polarization vector of linearly polarized emission from astrophysical sources. It is believed that if the relative rotation angle (ΔΘ) of the polarization vector of high-energy photons with respect to that of low-energy photons …
NU Ori: a hierarchical triple system with a strongly magnetic B-type star
Grellmann, R.; Wade, G. A.; Lacour, S. +13 more
NU Ori is a massive spectroscopic and visual binary in the Orion Nebula Cluster, with four components: Aa, Ab, B, and C. The B0.5 primary (Aa) is one of the most massive B-type stars reported to host a magnetic field. We report the detection of a spectroscopic contribution from the C component in high-resolution ESPaDOnS spectra, which is also det…