EPIC_204376071 Latitude and Longitude:
Sky map 16h 04m 10.1267s, −22° 34′ 45.5503″
From Wikipedia, the free encyclopedia

EPIC 204376071

Context star field of EPIC 204376071
Observation data
Epoch J2000.0       Equinox J2000.0 ( ICRS)
Constellation Scorpius
Right ascension 16h 04m 10.1267s [1]
Declination −22° 34′ 45.5503″ [1]
Characteristics
Evolutionary stage M [2]
Astrometry
Proper motion (μ) RA: -11.544 [1]  mas/ yr
Dec.: -24.892 [1]  mas/ yr
Parallax (π)7.3908 ± 0.1944  mas [1]
Distance440 ± 10  ly
(135 ± 4  pc)
Details
Mass0.161±0.028 [2] [3]  M☉
Radius0.631±0.042 [3]  R☉
Luminosity (bolometric)0.0273±0.0020 [2]  L☉
Temperature2960±75 [2]  K
Rotation1.63 days [4]
Age10 [5]  Myr
Other designations
UScoCTIO 48, 2MASS J16041012-2234453 [1]
Database references
SIMBAD data

EPIC 204376071 is an M-type star in the constellation of Scorpius. Parallax measurements by the Gaia space observatory put the star at a distance of about 440 light-years (130 parsecs) from Earth. [2] [3] [5] It is likely a member of the Upper Sco association, and is young enough that it has not yet become a main-sequence star. [2]

Unusual light fluctuations of the star, including up to an 80% dimming in brightness (i.e., "single 80% deep occultation of 1-day duration"), were observed by astronomers. [3] [5] The unusual dimming was not only extremely deep, but also substantially asymmetric, with an egress about twice as long as the ingress. [4] Nonetheless, such an unusual dimming for EPIC 204376071 is much greater than the 22% dimming observed for Tabby's star. [6] [7] Several explanations have been presented to explain the unusual dimming of the EPIC 204376071 star: one, orbiting dust or small particles; or two, a "transient accretion event of dusty material near the corotation radius of the star". [3] The unusual lightcurve of the star is similar to the lightcurve of a candidate exoplanet, KIC 10403228 b, which may have been caused by a "tilted ring system" orbiting the planet. In the case of EPIC 204376071, an orbiting brown dwarf or large planet, with a ring system, could cause a similar lightcurve, according to the researchers. [5]

Artist's concept of dust or small particles orbiting a star.

See also

References

  1. ^ a b c d e f Staff (2019). "EPIC 204376071 -- Star in Association". SIMBAD. Retrieved 6 March 2019.
  2. ^ a b c d e f Rappaport, S.; et al. (22 February 2019). "Deep Long Asymmetric Occultation in EPIC 204376071" (PDF). Monthly Notices of the Royal Astronomical Society. 485 (2): 2681–2693. arXiv: 1902.08152. Bibcode: 2019MNRAS.485.2681R. doi: 10.1093/mnras/stz537. S2CID  119470865. Retrieved 6 March 2019.
  3. ^ a b c d e Rappaport, S.; et al. (22 February 2019). "Deep Long Asymmetric Occultation in EPIC 204376071". Monthly Notices of the Royal Astronomical Society. 485 (2): 2681–2693. arXiv: 1902.08152. Bibcode: 2019MNRAS.485.2681R. doi: 10.1093/mnras/stz537. S2CID  119470865.
  4. ^ a b Nowakowski, Tomasz (5 March 2019). "Astronomers detect deep, long asymmetric occultation in a newly found low-mass star". Phys.org. Retrieved 6 March 2019.
  5. ^ a b c d Starr, Michelle (6 March 2019). "Astronomers Have Discovered Another Mysterious Dimming Star, And It's Even More Epic". ScienceAlert.com. Retrieved 6 March 2019.
  6. ^ Carpineti, Alfredo (6 March 2019). "We've Just Found Another Mysteriously Dimming Star In The Galaxy". IFLScience.com. Retrieved 6 March 2019.
  7. ^ Valdez, Rubi (8 March 2019). "Another Dimming EPIC Star Is Likely An Alien Planet, Astronomers Say". Tech Times. Retrieved 8 March 2019.

External links


Retrieved from " https://en.wikipedia.org/?title=EPIC_204376071&oldid=1154747101"