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Ground-based optical transmission spectrum of the hot Jupiter HAT-P-1b
Fortney, Jonathan J.; Stevenson, Kevin B.; Désert, Jean-Michel +6 more
Context. Time-series spectrophotometric studies of exoplanets during transit using ground-based facilities are a promising approach to characterize their atmospheric compositions.
Aims: We aim to investigate the transit spectrum of the hot Jupiter HAT-P-1b. We compare our results to those obtained at similar wavelengths by previous space-base…
GMRT 610 MHz observations of galaxy clusters in the ACT equatorial sample
Hilton, Matt; Sifón, Cristóbal; Bond, J. Richard +11 more
We present Giant Metrewave Radio Telescope (GMRT) 610 MHz observations of 14 Atacama Cosmology Telescope (ACT) clusters, including new data for nine. The sample includes 73 per cent of ACT equatorial clusters with M500 > 5 × 1014 M⊙. We detect diffuse emission in three of these (27^{+20}_{-14} per cent): we dete…
Absolute properties of RU Cnc revisited: an active RS CVn-type eclipsing binary with red giant branch and main-sequence components
Koçak, D.; Yakut, K.; Çokluk, K. A. +3 more
We present observations and analysis of an RS CVn-type double-lined eclipsing binary system, RU Cnc. The system has been observed for over a century. High-quality long-cadence observations, newly obtained from the Kepler K2 C5 and C18 campaigns, and two radial velocity curves were combined and analysed simultaneously, assuming a multispot model. T…
Araneiform terrain formation in Angustus Labyrinthus, Mars
Jaumann, R.; Hao, J.; Michael, G. G. +1 more
The south polar area of Mars exhibits an abundance of distinctive and exotic landforms, most of which occur within the region covered by the seasonal CO2 cap. Araneiform terrain (also referred to as terrain covered by "spiders") is one of these unusual geomorphic features, resulting from CO2 sublimation driven seasonal erosio…
Simulating Solar Coronal Mass Ejections Constrained by Observations of Their Speed and Poloidal Flux
Singh, T.; Yalim, M. S.; Pogorelov, N. V. +1 more
We demonstrate how the parameters of a Gibson-Low flux-rope-based coronal mass ejection (CME) can be constrained using remote observations. Our Multi-Scale Fluid-Kinetic Simulation Suite has been used to simulate the propagation of a CME in a data-driven solar corona background computed using the photospheric magnetogram data. We constrain the CME…
Universal detection of high-temperature emission in X-ray isolated neutron stars
Yoneyama, Tomokage; Hayashida, Kiyoshi; Nakajima, Hiroshi +1 more
Strongly magnetized isolated neutron stars (NSs) are categorized into two families, according mainly to their magnetic field strength. Those with a higher magnetic field of 1014-1015 G are called magnetars, characterized by repeated short bursts, and the others are X-ray isolated neutron stars (XINSs) with 1013 G. …
X-Ray and Gamma-Ray Emission from Core-collapse Supernovae: Comparison of Three-dimensional Neutrino-driven Explosions with SN 1987A
Fransson, Claes; Janka, Hans-Thomas; Alp, Dennis +7 more
During the first few hundred days after the explosion, core-collapse supernovae (SNe) emit down-scattered X-rays and gamma-rays originating from radioactive line emissions, primarily from the 56Ni → 56Co → 56Fe chain. We use supernova (SN) models based on three-dimensional neutrino-driven explosion simulations of s…
Identification of organic molecules with a laboratory prototype based on the Laser Ablation-CosmOrbitrap
Engrand, C.; Vuitton, V.; Briois, C. +18 more
In the Solar System, extra-terrestrial organic molecules have been found on cometary primitive objects, on Titan and Enceladus icy moons and on Mars. Identification could be achieved for simple organic species by remote sensing based on spectroscopic methods. However in situ mass spectrometry is a key technology to determine the nature of more com…
The subgiant HR 7322 as an asteroseismic benchmark star
Huber, Daniel; Stokholm, Amalie; White, Timothy R. +5 more
We present an in-depth analysis of the bright subgiant HR 7322 (KIC 10005473) using Kepler short-cadence photometry, optical interferometry from CHARA, high-resolution spectra from SONG, and stellar modelling using GARSTEC grids, and the Bayesian grid-fitting algorithm BASTA. HR 7322 is only the second subgiant with high-quality Kepler asteroseism…
Pluto's ephemeris from ground-based stellar occultations (1988-2016)
Sicardy, B.; Gomes-Júnior, A. R.; Ortiz, J. L. +13 more
Context. From 1988 to 2016, several stellar occultations have been observed to characterise Pluto's atmosphere and its evolution. From each stellar occultation, an accurate astrometric position of Pluto at the observation epoch is derived. These positions mainly depend on the position of the occulted star and the precision of the timing.
Aims…