WISPIT 2
.jpg) The disk around WISPIT 2 with VLT SPHERE. The protoplanet WISPIT 2b is inside the gap of the disk on the lower right Credit: ESO/R. F. van Capelleveen et al. | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquila |
| Right ascension | 19h 23m 17.03s |
| Declination | −07° 40′ 55.07″ |
| Apparent magnitude (V) | 11.60±0.12[1] |
| Characteristics | |
| Evolutionary stage | pre-main-sequence star |
| Astrometry | |
| Radial velocity (Rv) | −16.23±14.58[2] km/s |
| Proper motion (μ) | RA: 6.308±0.024 mas/yr[2] Dec.: −27.138±0.018 mas/yr[2] |
| Parallax (π) | 7.4649±0.0214 mas[2] |
| Distance | 437 ± 1 ly (134.0 ± 0.4 pc) |
| Details[2] | |
| Mass | 1.08+0.06 −0.17 M☉ |
| Radius | 1.418±0.004 R☉ |
| Luminosity (bolometric) | 0.699±0.021 L☉ |
| Surface gravity (log g) | 4.00±0.25 cgs |
| Temperature | 4400±50 K |
| Rotation | 4.7004 days |
| Age | 5.1+2.4 −1.3 Myr |
| Other designations | |
| TYC 5709-354-1, IRAS 19205-0746, IRAS F19205-0746, Gaia DR2 4207586980945067648 | |
| Database references | |
| SIMBAD | data |
WISPIT 2 (also called TYC 5709-354-1) is a pre-main-sequence star in the constellation Aquila. It is part of the Scorpius-Centaurus OB association, likely belonging to the subgroup Theia 53. The star has a directly imaged circumstellar disk with multiple rings and one directly imaged protoplanet inside one of the gaps.[2] This protoplanet was also detected in H-alpha, showing it is surrounded by a circumplanetary disk.[3]
The circumstellar disk
[edit]The disk was classified as transitional, meaning it has an inner cavity.[3] The disk has 4 rings and one prominent gap at 68 astronomical units (AU). The outermost ring is located at 316 AU and the disk was detected out to a distance of 2.8 arcseconds (380 AU) from the star. The inclination of the disk is around 44° to 46°.[2]
Planetary system
[edit]Observations with VLT SPHERE,[2] Magellan MagAO-X and LBT/LMIRcam revealed one planet located inside gap 3.[3] The protoplanet was confirmed to move with the star and shows orbital motion in images from October 2023 to April 2025. The planet has a mass of around 5 MJ and is responsible for clearing a gap inside the disk.[2] The protoplanet is also detected in H-alpha, showing that it is accreting material from a circumplanetary disk. This makes WISPIT 2b similar to the PDS 70 planets, 2MJ1612b and possibly LkCa 15b.[3]
One additional inner candidate planet was detected, but CC1 could also be a dust clump and needs further observations to be confirmed as a planet.[3]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (years) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| CC1 (unconfirmed) | 9±4 MJ | 15 | — | — | — | — |
| Ring 3 | 38.44±0.09 AU | 44.95±0.39° | — | |||
| b | 5.3±1.0 MJ | 57.5 | — | — | — | 1.6±0.2 RJ |
| Gap 3 | 69.0±0.6 AU | 44.2±0.8° | — | |||
| Ring 2 | 96.7±0.6 AU | 41.8±0.6° | — | |||
| Ring 1 | 163.6±2.9 AU | 45.4±1.1° | — | |||
| Ring 0 | 316.4±4.5 AU | 43.6±1.5° | — | |||
See also
[edit]References
[edit]- ^ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27 – L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.
- ^ a b c d e f g h i van Capelleveen, Richelle F.; Ginski, Christian; Kenworthy, Matthew A.; Byrne, Jake; Lawlor, Chloe; McLachlan, Dan; Mamajek, Eric E.; Stolker, Tomas; Benisty, Myriam; Bohn, Alexander J.; Close, Laird M.; Dominik, Carsten; Haffert, Sebastiaan; Landman, Rico; Ma, Jie (2025-08-26). "WIde Separation Planets In Time (WISPIT): A Gap-clearing Planet in a Multi-ringed Disk around the Young Solar-type Star WISPIT 2". The Astrophysical Journal Letters. 990 (1): L8. arXiv:2508.19053. Bibcode:2025ApJ...990L...8V. doi:10.3847/2041-8213/adf721. ISSN 2041-8205.
- ^ a b c d e f Close, Laird M.; van Capelleveen, Richelle F.; Weible, Gabriel; Wagner, Kevin; Haffert, Sebastiaan Y.; Males, Jared R.; Ilyin, Ilya; Kenworthy, Matthew A.; Li, Jialin; Long, Joseph D.; Ertel, Steve; Ginski, Christian; Weinberger, Alycia J.; Follette, Kate; Liberman, Joshua (2025-08-26). "Wide Separation Planets in Time (WISPIT): Discovery of a Gap Hα Protoplanet WISPIT 2b with MagAO-X". The Astrophysical Journal Letters. 990 (1): L9. arXiv:2508.19046. Bibcode:2025ApJ...990L...9C. doi:10.3847/2041-8213/adf7a5. ISSN 2041-8205.
