2013A&A...558A.139V


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.11CEST19:15:19

2013A&A...558A.139V - Astronomy and Astrophysics, volume 558A, 139-139 (2013/10-1)

X-ray detection of GJ 581 and simultaneous UV observations.

VITALE V. and FRANCE K.

Abstract (from CDS):

The M3 dwarf GJ 581 hosts a rich system of exo-planets, some of which are potentially within or at the edge of the habitable zone. Nevertheless, the system habitability might be reduced by large and sterilizing high energy emission flares, if these are frequent. The GJ 581 radiation environment was studied with simultaneous X-ray and UV observations, which were performed with the XRT and UVOT instruments, respectively, on board of the Swift satellite. X-ray and UV data were analysed with the distributed standard tools. The dwarf GJ 581 was detected for the first time in the 0.2-10keV range with an intensity of (8±2)x10–4cts/s and a signal-to-noise ratio of 3.6. If black-body or APEC spectra are assumed, then the source X-ray flux is found to be between 1.8 and 3.3x10–14erg/cm2/s and log10(LX) between 25.914 and 26.176. Despite hints of X-ray variability, better statistics are needed to establish robust evidence for this property. The UV measurements, obtained during 13 pointings, are also reported. A combination of these Swift X-ray and Hubble Space Telescope UV measurements (with Lyman-alpha) indicate a low X-ray to UV luminosity ratio of ∼4%. Simultaneous X-ray and UV observations of GJ 581 are reported. These constitute an experimental view of the system radiation environment, which will be a useful input for the habitability studies of the GJ 581 planetary system.

Abstract Copyright:

Journal keyword(s): astrobiology - stars: flare

Simbad objects: 10

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Number of rows : 10

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 HD 33793 Ro* 05 11 40.5893175460 -45 01 06.353955874 11.624 10.433 8.853 7.9 6.899 M1VIp 282 0
2 BD+05 1668 PM* 07 27 24.49975 +05 13 32.8332 12.558 11.443 9.872 8.699 7.161 M3.5V 339 0
3 BD+20 2465 Er* 10 19 36.2808024653 +19 52 12.014037746   10.82 9.52 9.19   M4Vae 1146 0
4 Wolf 359 Er* 10 56 28.826208 +07 00 52.34400 16.706 15.541 13.507 11.684 9.507 M6Ve 633 0
5 HD 95735 Fl* 11 03 20.19400 +35 58 11.5682 10.030 8.960 7.520 5.99 4.79 M2+V 624 1
6 V* V645 Cen Er* 14 29 42.9451234609 -62 40 46.170818907 14.21 12.95 11.13 9.45 7.41 M5.5Ve 958 0
7 BD-07 4003d Pl 15 19 26.8271336166 -07 43 20.190958776           ~ 136 1
8 BD-07 4003 BY* 15 19 26.8271336166 -07 43 20.190958776 13.403 11.76 10.560 9.461 8.911 M3V 534 2
9 V* EV Lac Er* 22 46 49.7311740821 +44 20 02.372223230   11.85 10.26 9.89   M4.0V 801 2
10 BD-15 6290 BY* 22 53 16.7323107416 -14 15 49.303409936 12.928 11.749 10.192 9.013 7.462 M3.5V 856 1

    Equat.    Gal    SGal    Ecl

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2020.07.11-19:15:19

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