| 词条 | EPIC 204376071 |
| 释义 |
| name = EPIC 204376071{{Starbox image | image = | caption = Context star field of EPIC 204376071{{Starbox observe | epoch = J2000.0 (ICRS) | constell = Scorpius | ra = {{RA|16|04|10.1267}}[1] | dec = {{DEC|-22|34|45.5503}}[1] | appmag_v ={{Starbox character | type = M[3] | class = | r-i = | v-r = | b-v = | j-h = | j-k ={{Starbox astrometry | radial_v = | prop_mo_ra = -11.544[1] | prop_mo_dec = -24.892[1] | parallax = 7.3908 | p_error = 0.1944 | parallax_footnote = [1] | absmag_v = }}{{Starbox detail | mass = {{val|0.161|0.028}}[3][8] | radius = {{val|0.631|0.042}}[8] | luminosity_bolometric = {{val|0.0273|0.0020}}[3] | luminosity_visual = | gravity = | temperature = {{val|2960|75}}[3] | metal_fe = | rotation = {{val|1.63|}} days[12] | rotational_velocity = | age_myr = 10[13]{{Starbox catalog | names = {{odlist|name=UScoCTIO 48|2MASS=J16041012-2234453}}[1]{{Starbox reference | Simbad = EPIC+204376071 | KIC ={{Starbox end}}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 {{Convert|440|ly|pc|abbr=off|lk=on}} from Earth.[3][8][13] It is likely a member of the Upper Sco Association, and is young enough that it has not yet become a main-sequence star yet.[3] 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.[8][13] The unusual dimming was not only extremely deep, but also substantially asymmetric, with an egress about twice as long as the ingress.[12] Nonetheless, such an unusual dimming for EPIC 204376071 is much greater than the 22% dimming observed for Tabby's star.[23] 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".[8] The unusual lightcurve of the star is similar to the lightcurve of a candidate exoplanet, KIC 10403228, 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.[13] See also{{div col|colwidth=30em}}
References1. ^1 2 {{cite news |last=Nowakowski |first=Tomasz |title=Astronomers detect deep, long asymmetric occultation in a newly found low-mass star |url=https://phys.org/news/2019-03-astronomers-deep-asymmetric-occultation-newly.html |date=5 March 2019 |work=Phys.org |accessdate=6 March 2019 }} [1][2][3][4][5][6]2. ^1 2 3 4 5 {{cite journal |author=Rappaport, S. |display-authors=et al. |title=Deep Long Asymmetric Occultation in EPIC 204376071 |url=https://academic.oup.com/mnras/advance-article-abstract/doi/10.1093/mnras/stz537/5362657 |date=22 February 2019 |journal=Monthly Notices of the Royal Astronomical Society |doi=10.1093/mnras/stz537 |accessdate=6 March 2019 }} 3. ^1 2 3 4 5 6 {{cite journal |author=Rappaport, S. |display-authors=et al. |title=Deep Long Asymmetric Occultation in EPIC 204376071 |url=http://orbit.dtu.dk/files/169254901/stz537.pdf |format=PDF |date=22 February 2019 |journal=Monthly Notices of the Royal Astronomical Society |doi=10.1093/mnras/stz537 |accessdate=6 March 2019 }} 4. ^1 2 3 4 {{cite news |last=Starr |first=Michelle |title=Astronomers Have Discovered Another Mysterious Dimming Star, And It's Even More Epic |url=https://www.sciencealert.com/tabby-s-star-has-a-friend-there-s-another-weird-mystery-star-in-town |date=6 March 2019 |work=ScienceAlert.com |accessdate=6 March 2019 }} 5. ^1 2 3 4 5 6 {{cite web |author=Staff |title=EPIC 204376071 -- Star in Association |url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=EPIC%20204376071 |date=2019 |work=SIMBAD |accessdate=6 March 2019 }} 6. ^1 {{cite news |last=Valdez |first=Rubi |title=Another Dimming EPIC Star Is Likely An Alien Planet, Astronomers Say |url=https://www.techtimes.com/articles/239240/20190308/another-dimming-epic-star-is-likely-an-alien-planet-astronomers-say.htm |date=8 March 2019 |work=Tech Times |accessdate=8 March 2019 }} }} External links
4 : Astronomical objects discovered in 2019|2019 in science|Scorpius–Centaurus Association|Unsolved problems in astronomy |
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