![]() 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 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]
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 ° | — |