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Astrometric study of Gaia DR2 stars for interstellar communication
Seto, Naoki; Kashiyama, Kazumi
We discuss the prospects of high precision pointing of our transmitter to habitable planets around Galactic main sequence stars. For an efficient signal delivery, the future sky positions of the host stars should be appropriately extrapolated with accuracy better than the beam opening angle $\Theta$ of the transmitter. Using the latest data releas…
Properties of CVSO 30 from TESS measurements: probably a binary T Tauri star with complex light curves and no obvious planets
Koen, Chris
'Transiting Exoplanet Survey Satellite' (TESS) photometry of CVSO 30 spanned 21.8 d, with a single large gap of 1.1 d. This allows alias-free determination of the two periodicities in the data. It is confirmed that both of these are non-sinusoidal: the dominant P1 = 0.4990 d has two detectable harmonics and P2 = 0.4486 d has …
The horizontal branch morphology of the globular cluster NGC 1261 using AstroSat
Rao, N. Kameswara; Subramaniam, Annapurni; Rani, Sharmila +2 more
We present the results obtained from the UV photometry of the globular cluster NGC 1261 using far-UV (FUV) and near-UV (NUV) images acquired with the Ultraviolet Imaging Telescope (UVIT) on-board the AstroSat satellite. We utilized the UVIT data combined with HST, GAIA, and ground-based optical photometric data to construct the different UV colour…
Characterization of very wide companion candidates to young stars with planets and disks
Alcalá, J. M.; D'Orazi, V.; Frasca, A. +6 more
Discovering wide companions of stellar systems allows us to constrain the dynamical environment and age of the latter. We studied four probable wide companions of four different stellar systems. The candidates were selected mainly based on their similar kinematic properties to the central star using Gaia DR2. The central stars are V4046 Sgr, HIP 7…
Elucidating the global distribution of reprocessing gas in NGC 1194
Turner, T. J.; Kraemer, S. B.; Reeves, J. N. +3 more
A joint XMM-Newton and NuSTAR observation was conducted for the bright, local Seyfert 1.9 galaxy, NGC 1194. The hard spectral form of this active galactic nucleus (AGN) was modelled using the toroidal reprocessor MYTORUS. The decoupled model form provides a good description of the spectrum, with reflection arising from gas with a global average co…
Martian Lander Radio Science Data Calibration for Mars Troposphere
Le Maistre, S.
The tropospheric propagation effect is one of several sources of error in radio science measurements. Systematically calibrated for the Earth troposphere disturbances, the ranging and Doppler data provided by the Martian landers have not been corrected so far for Mars troposphere effects. These effects were considered negligible because the Mars a…
Dust extinction towards the type Ia supernova 2012cu in NGC 4772
Gao, Jian; Jiang, Biwei; Li, Jun +2 more
Using photometric and spectroscopic data of Supernova (SN) 2012cu, a fairly reddened type Ia supernova, we derived its color excess curves and probed the dust extinction in its host galaxy, NGC 4772. In order to derive the extinction as a function of wavelength (i.e., Aλ), we model the color excess curves of SN 2012cu in terms of dust m…
In Search of an Interface between Warm and Hot Gas within the Local Bubble
Jenkins, Edward B.; Gry, Cécile
We have examined UV spectra recorded by the Space Telescope Imaging Spectrograph on the Hubble Space Telescope for three stars, HD32309, 41 Ari, and η Tel, that are located well inside the boundary of the Local Hot Bubble in our search for absorption features of Si IV, C IV, and N V that could reveal the presence of an interface between the local …
Proton-proton collisional age to order solar wind types
Wimmer-Schweingruber, Robert F.; Berger, Lars; Heidrich-Meisner, Verena
Context. The properties of a solar wind stream are determined by its source region and by transport effects. Independently of the solar wind type, the solar wind measured in situ is always affected by both. This means that reliably determining the solar wind type from in situ observations is useful for the analysis of its solar origin and its evol…
A Multiwavelength Analysis of the Long-duration Flare Observed on 15 April 2002
Mrozek, Tomasz; Kepa, Anna; Sylwester, Barbara +2 more
We present a multiwavelength analysis of the long-duration flare observed on 15 April 2002 (soft X-ray peak time at 03:55 UT, SOL2002-04-15T03:55). This flare occurred on the disk (S15W01) in NOAA 9906 and was observed by a number of space instruments including the Extreme-Ultraviolet Imaging Telescope on the Solar and Heliospheric Observatory (SO…