List of stars that have unusual dimming periods

This list contain stars that had periods when their apparent magnitude dropped in a way that is not typical of any class of variable stars. Most of these dimming events happened due to an occultation by a dust cloud or dust disk, but many remain without explanation.

List

Star designation Stellar
class 		Magnitude Right ascension
(J2000) 		Declination
(J2000) 		Distance
(light-years) 		Reason for dimming
Apparent Absolute
ASASSN-V J193622.23+115244.1 — 14.0–15.5[1] — 19h 36m 22.23s[1] +11° 52′ 44.1″[1] 6592[1] Unknown
ASASSN-V J213939.3-702817.4 F0V[2] 12.95–14.22[3] 2.5[3] 21h 39m 39.3s[3] −70° 28′ 17.4″[3] 3630[2] Unknown
Betelgeuse M1-2[4] +0.50[5] — 05h 55m 10.30536s[6] +07° 24′ 25.4304″[6] — "large-grain circumstellar dust"[7][8]
EPIC 204278916 M1[9] 13.7[10] — 16h 02m 07.576s[11] −22° 57′ 46.89″[11] — Dust disk
EPIC 204376071 M[12] — — 16h 04m 10.1267s[13] −22° 34′ 45.5503″[13] 440[12] Possibly giant planet or brown dwarf with rings
HD 139139
(EPIC 249706694) 		G3/5V 9.84;[14] 9.677[15] — 15h 37m 06.215s[15] −19° 08′ 32.96″[15] 350[16]
572[15] 		Unknown. It is possible that it didn't had a dimming event at all, and the observed dimmings were due to instrumental errors.
KH 15D K7[17] 15.5–21.5[18] 6.226[19] 06h 41m 10.31s[20] +09° 28′ 33.2″[20] 773[21] Possibly circumbinary disk
KIC 4150611
(HD 181469) 		Pulsator/K/M/G — — 19h 18m 58.21759s[22] +39° 16′ 01.7913″[22] — Five-star system
PDS 110 keF6 IVeb[23] 10.422[23] 2.54[23] 05h 23m 31.008s[23] –01° 04′ 23.68″[23] 1090[23] Possibly eclipses by circumstellar dust[24]
RW Cephei K2 0-Ia[25] 6.0–7.6[26] — 22h 23m 07.01521s[27] +55° 57′ 47.6244″[27] 11,000[28][a] Great dimming event similar to Betelgeuse
RZ Piscium K0 IV[29] 11.29–13.82[29] — 01h 09m 42.056s[30] +27° 57′ 1.95″[30] 550[31] Substantial mass of gas and dust, possibly from disrupted planet
Tabby's Star
(KIC 8462852) 		F3V[32][33] 11.705[33] 3.08[32] 20h 06m 15.4527s[32] +44° 27′ 24.791″[32] 1470[32] Unknown
TIC 400799224 — — — — — — "probably from an orbiting body that periodically emits clouds of dust that occult the star"[34][35]
V1400 Centauri K5 IV(e) Li[36] 12.31[36] — 14h 07m 47.93s[36] −39° 45′ 42.7″[36] 434[37] Eclipse by a free-floating brown dwarf or rogue planet with a circumstellar disk or ring system[38]
VVV-WIT-07 — 14.35–16.164[39] — 17h 26m 29.387s[39] −35° 40′ 6.20″[39] 23000/?[39] Unknown
WD 1145+017
(EPIC 201563164) 		DB[40] 17.0[41] — 11h 48m 33.63s[40] +01° 28′ 59.4″[40] 570[42] Dust disk
ZTF J0139+5245
(ZTF J013906.17+524536.89) 		DA[43] 18.4[43] — 01h 39m 06.17s +52° 45′ 36.89″ 564[43] Dust disk
Gaia17bpp M0-III 16.13–20.48[44] — 19h 37m 23.16s +17° 59′ 02.90″ 27,600[45] Dust disk
Gaia21bcv K4.5V 17.70–20.12 3.2 07h 14m 33.276s −12° 13′ 27.34″ 4,508 Eclipse by a substellar companion with a 0.5 AU-radius debris disk[46]
ASASSN-21js B[b] 12.8 1.38 11h 47m 11.754s −62° 10′ 36.80″ 9,149 Eclipse by a distant substellar companion with a 1.05 AU-radius debris disk[47]
WD 1054–226 DAZ 16.0 — 10h 56m 38.63s −22° 52′ 56.08″ 118 Debris disc[48]

See also

Notes

  1. ^ Assuming membership to Cepheus OB1
  2. ^ ASASSN-21js's temperature of 14800+4200
    −2800     K     lies within the temperature range for B-type main-sequence stars.[47]

References

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