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Individual dynamical masses of DENIS J063001.4-184014AB reveal a likely young brown dwarf triple
Martín, E. L.; Sahlmann, J.; Burgasser, A. J. +6 more
The binary nature of the M8.5 dwarf DENIS J063001.4-184014AB (DE0630-18) was discovered with astrometric monitoring from the ground, which determined the unresolved photocentric orbit and the trigonometric parallax of the system. Here we present radial velocity monitoring and resolved observations in the near-infrared with Keck aperture masking th…
Fundamental parameters for 30 faint open clusters with Gaia EDR3 based on the more reliable members
Ding, Xu; Yu, Xiao-Guang; Ji, Kai-Fan +4 more
An open cluster is an ideal region to study the evolution of stars. In this work, we use Gaia Early Data Release 3 (Gaia EDR3) to derive the fundamental parameters of 30 faint open clusters listed in the catalogue given by Cantat-Gaudin et al. (2018, A&A, 618, A93), but the G magnitude of all of the member stars of that catalogue is brighter t…
YY Hya and its interstellar environment
Thorstensen, John R.; Fesen, Robert A.; Przybilla, Norbert +7 more
Context. During a search for previously unknown Galactic emission nebulae, we discovered a faint 36' diameter Hα emission nebula centered around the periodic variable YY Hya. Although this star has been classified as an RR-Lyr variable, such a classification is inconsistent with a Gaia distance of ≃450 pc. The GALEX image data also show YY Hya as …
Impact of gradients at the martian terminator on the retrieval of ozone from SPICAM/MEx
Aoki, S.; Vandaele, A. C.; Daerden, F. +11 more
Rapid variations of pressure, temperature and illumination at the day-night terminator have the potential to cause asymmetries in the abundance distribution of the atmosphere constituents along the line of sight (LOS) of a solar occultation experiment. Ozone, in particular, displays steep density gradients across the terminator of Mars due to phot…
BO Ari Light Curve Analysis using Ground-Based and TESS Data
Poro, Atila; Rezaei, Samaneh; Aksaker, Nazim +4 more
We present new BVR band photometric light curves of BO Aries obtained in 2020 and combined them with the Transiting Exoplanet Survey Satellite (TESS) light curves. We obtained times of minima based on Gaussian and Cauchy distributions and then applied the Monte Carlo Markov Chain (MCMC) method to measure the amount of uncertainty from our CCD phot…
Mode identification and seismic study of δ Scuti, the prototype of a class of pulsating stars
Handler, G.; Pigulski, A.; Daszyńska-Daszkiewicz, J. +3 more
We present a seismic study of δ Scuti based on a mode identification from multicoulor photometry. The dominant frequency can be associated only with a radial mode and the second frequency is, most probably, a dipole mode. The other six frequencies have more ambiguous identifications. The photometric mode identification provided also some constrain…
Steepening of magnetosonic waves in the inner coma of comet 67P/Churyumov-Gerasimenko
Henri, Pierre; Goetz, Charlotte; Richter, Ingo +7 more
We present a statistical survey of large-amplitude, asymmetric plasma and magnetic field enhancements detected outside the diamagnetic cavity at comet 67P/Churyumov-Gerasimenko from December 2014 to June 2016. Based on the concurrent observations of plasma and magnetic field enhancements, we interpret them to be magnetosonic waves. The aim is to p…
Sampling Plume Deposits on Enceladus' Surface to Explore Ocean Materials and Search for Traces of Life or Biosignatures
Malaska, Michael J.; Choukroun, Mathieu; Backes, Paul +14 more
Enceladus is unique as an astrobiology target in that it hosts an active plume sourced directly from its habitable subsurface ocean. Ice particles from the plume contain geochemical constituents that are diagnostic of the ocean conditions, and may hold traces of life and/or biosignatures, if they exist. Up to 93% of the plume particles fall back o…
The hot interstellar medium towards 4U 1820-30: a Bayesian analysis
Waters, L. B. F. M.; Costantini, E.; Mehdipour, M. +3 more
Context. High-ionisation lines in the soft X-ray band are generally associated to either interstellar hot gas along the line of sight or to photoionised gas intrinsic to the source. In the low-mass X-ray binary 4U 1820-30, the nature of these lines is not well understood.
Aims: We aim to characterise the ionised gas present along the line of …
Forward Modeling of Simulated Transverse Oscillations in Coronal Loops and the Influence of Background Emission
Van Doorsselaere, Tom; Antolin, Patrick; Li, Bo +1 more
We simulate transverse oscillations in radiatively cooling coronal loops and forward-model their spectroscopic and imaging signatures, paying attention to the influence of background emission. The transverse oscillations are driven at one footpoint by a periodic velocity driver. A standing kink wave is subsequently formed and the loop cross sectio…