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Secondary eclipse of the hot Jupiter WASP-121b at 2 µm
Kovács, Géza; Kovács, Tamás
Ground-based observations of the secondary eclipse in the 2MASS K band are presented for the hot Jupiter WASP-121b. These are the first occultation observations of an extrasolar planet that were carried out with an instrument attached to a 1 m class telescope (the SMARTS 1.3 m). We find a highly significant eclipse depth of (0.228 ± 0.023)%. Toget…
Testing the weak equivalence principle by differential measurements of fundamental constants in the Magellanic Clouds
Wang, W. -H.; Levshakov, S. A.; Agafonova, I. I. +4 more
Non-standard fields are assumed to be responsible for phenomena attributed to dark energy and dark matter. Being coupled to ordinary matter, these fields modify the masses and/or charges of the elementary particles, thereby violating the weak equivalence principle. Thus, values of fundamental constants such as the proton-to-electron mass ratio, &m…
The outbursting protostar 2MASS 22352345 + 7517076 and its environment
Prusti, T.; Ábrahám, P.; Kun, M. +2 more
We studied the Class I protostar 2MASS 22352345 + 7517076 whose dramatic brightening between the IRAS, Akari, and WISE surveys was reported by Onozato et al. 2MASS 22352345+7517076 is a member of a small group of low-mass young stellar objects, associated with IRAS 22343 + 7501 in the molecular cloud Lynds 1251. The IRAS, ISO, Spitzer, Akari, Hers…
The ultracool helium-atmosphere white dwarf companion of PSR J0740+6620?
Zharikov, S. V.; Karpova, A. V.; Zyuzin, D. A. +4 more
We report detection of the likely companion of the binary millisecond pulsar (MSP) J0740+6620 with the Gran Telescopio Canarias in the r' and i' bands. The position of the detected starlike source coincides with the pulsar coordinates within the 1σ uncertainty of ≈0.2 arcsec. Its magnitudes are r' = 26.51 ± 0.17 and i' = 25.49 ± 0.15. Comparing th…
MASCARA-3b. A hot Jupiter transiting a bright F7 star in an aligned orbit
Snellen, I. A. G.; Grundahl, F.; Hjorth, M. +12 more
We report the discovery of MASCARA-3b, a hot Jupiter orbiting its bright (V = 8.33) late F-type host every 5.55149 ± 0.00001 days in an almost circular orbit (e = 0.050-0.017+0.020). This is the fourth exoplanet discovered with the Multi-site All-Sky CAmeRA (MASCARA), and the first of these that orbits a late-type star. Follo…
Revealing a Highly Dynamic Cluster Core in Abell 1664 with Chandra
Baum, Stefi A.; O'Dea, Christopher P.; McNamara, Brian R. +11 more
We present new, deep (245 ks) Chandra observations of the galaxy cluster Abell 1664 (z = 0.1283). These images reveal rich structure, including elongation and accompanying compressions of the X-ray isophotes in the NE-SW direction, suggesting that the hot gas is sloshing in the gravitational potential. This sloshing has resulted in cold fronts, at…
The white dwarf luminosity functions from the Pan-STARRS 1 3π Steradian Survey
Chambers, Kenneth C.; Magnier, Eugene A.; Wainscoat, Richard J. +9 more
A large sample of white dwarfs is selected by both proper motion and colours from the Pan-STARRS 1 3π Steradian Survey Processing Version 2 to construct the white dwarf luminosity functions of the discs and halo in the solar neighbourhood. Four-parameter astrometric solutions were recomputed from the epoch data. The generalized maximum volume meth…
Be and O in the ultra metal-poor dwarf 2MASS J18082002-5104378: the Be-O correlation
Bonifacio, P.; Caffau, E.; Spite, M. +3 more
Context. Measurable amounts of Be could have been synthesised primordially if the Universe were non-homogeneous or in the presence of late decaying relic particles.
Aims: We investigate the Be abundance in the extremely metal-poor star 2MASS J1808-5104 ([Fe/H] = -3.84) with the aim of constraining inhomogeneities or the presence of late decay…
Nuclear angular momentum of early-type galaxies hosting nuclear star clusters
Lyubenova, Mariya; Tsatsi, Athanassia
Context. Nucleation is a common phenomenon in all types of galaxies and at least 70% of them host nuclear star clusters (NSCs) in their centres. Many of the NSCs co-habit with supermassive black holes and follow similar scaling relations with host galaxy properties. Unlike black holes, NSCs, preserve the signature of their evolutionary path imprin…
High-drag Interstellar Objects and Galactic Dynamical Streams
Eubanks, T. M.
The nature of 1I/’Oumuamua (henceforth, 1I), the first interstellar object (ISO) known to pass through the solar system, remains mysterious. Feng & Jones noted that the incoming 1I velocity vector “at infinity” ({v}∞ ) is close to the motion of the Pleiades dynamical stream (or Local Association), and suggested that 1I is a young ob…