HR 2562 B
| Discovery | |
|---|---|
| Discovered by | Q. Konopacky et al.[1] |
| Discovery date | 2016 |
| Direct imaging | |
| Orbital characteristics[2] | |
| 22.2+3.8 −2.9 AU | |
| Eccentricity | 0.34+0.23 −0.18 |
| 71.5+35.7 −23.2[3] yr | |
| Inclination | 86.7+0.5 −0.7° |
| 119.5+0.3 −0.7 | |
| 37+32 −24 | |
| Star | HR 2562 |
| Physical characteristics | |
| 0.89+0.14 −0.27[4] RJ | |
| Mass | < 22[2] MJ |
| log(g) = 4.70±0.32 m/s2[1] | |
| Temperature | 1,200±100 K[1] |
HR 2562 B is a substellar companion orbiting the star HR 2562. Discovered in 2016 by a team led by Quinn M. Konopacky by direct imaging, HR 2562 B orbits within the inner edge of HR 2562's circumstellar disc—as of April 2023, it is one of only two known brown dwarfs to do so.[3] Separated by roughly 20 astronomical units (3.0×109 km) from its primary companion, HR 2562 B has drawn interest for its potential dynamical interactions with the outer circumstellar disc.
Discovery
HR 2562 B was discovered using the Gemini Planet Imager (GPI), which first observed the star HR 2562 in January 2016. In the initial data set, Konopacky and collaborators identified a candidate companion object. As a result, followup observations were conducted within the following month in the infrared K1-, K2-, and J-bands. Within the processed data set, HR 2562 B was confirmed to share a common proper motion with HR 2562, with Konopacky and collaborators announcing its discovery in a paper published on 14 September 2016.[1]
Properties
Orbital properties
Initial observations of HR 2562 B by Konopacky and collaborators yielded a separation of 20.3 ± 0.3 AU (3.037×109 ± 45,000,000 km), placing it interior to and coplanar with the inner edge of HR 2562's observed debris disc.[1] Further observations of HR 2562 B by the Atacama Large Millimeter Array (ALMA) supported this, yielding a semi-major axis of 19.0+5.7
−4.4 AU, an orbital period of 71.5+35.7
−23.2 yr, and an orbital eccentricity of 0.63+0.32
−0.23. With a probable orbital inclination of 82.8°+2.0°
−12.5°, HR 2562 B's misalignment angle with the debris disc is either 7°+17°
−4° or 15°+18°
−5°. However, the limited coverage of observations still leaves a wide range of possible orbits; both low-eccentricity, coplanar orbits and high-eccentricity, misaligned orbits would be consistent with observation data. However, a highly misaligned orbit would significantly perturb the disc, suggesting that a low-eccentricity, coplanar solutions are likelier.[3] A 2025 study using astrometry and radial velocity refined the orbital elements, finding a separation of 22.2 AU, a significantly lower eccentricity of 0.34, and an inclination of 86.7°, which implies a planet-disk inclination of 3.7±0.3°.[2]
Physical properties
HR 2562 B's exact mass is unknown. The brown dwarf was estimated to be 29±15 MJ in 2021.[4] However, subsequent observations placed an upper mass limit of 18.5 MJ[3] and later 22 MJ.[2] Its luminosity is about 1/40 000 solar luminosity.[1][note 1] Its spectral type is L7±3.[1]
See also
- PZ Telescopii B, another substellar object with mass slightly below 30 MJ
Notes
References
- ^ a b c d e f g h Konopacky, Quinn M.; Rameau, Julien; Duchêne, Gaspard; Filippazzo, Joseph C.; Godfrey, Paige A. Giorla; Marois, Christian; Nielsen, Eric L.; Pueyo, Laurent; Rafikov, Roman R. (2016). "Discovery of a Substellar Companion to the Nearby Debris Disk Host HR 2562". The Astrophysical Journal Letters. 829 (1): L4. arXiv:1608.06660. Bibcode:2016ApJ...829L...4K. doi:10.3847/2041-8205/829/1/L4. ISSN 2041-8205. S2CID 44216698.
- ^ a b c d Roberts, Jonathan; Thompson, William; Wang, Jason J.; Blunt, Sarah; Balmer, William O.; Bourdarot, Guillaume; Bowler, Brendan P.; Chauvin, Gael; Eisenhauer, Frank; Henning, Thomas K.; Kammerer, Jens; Kiefer, Flavien; Kenworthy, Matthew A.; Kervella, Pierre; Lacour, Sylvestre; Lagrange, A. -M.; Nielsen, Eric L.; Pueyo, Laurent; Rickman, Emily; Sipilä, Olli; Spezzano, Silvia; Stolker, Tomas; Zurlo, Alice (2025). "New Orbital Constraints for YSES 1 b and HR 2562 B from High-Precision Astrometry and Planetary Radial Velocities". arXiv:2509.14321 [astro-ph.EP].
- ^ a b c d Zhang, Stella Yimao; et al. (28 April 2023). "Testing the Interaction between a Substellar Companion and a Debris Disk in the HR 2562 System". The Astronomical Journal. 165 (5): 219. arXiv:2302.04893. Bibcode:2023AJ....165..219Z. doi:10.3847/1538-3881/acbafb.
- ^ a b Sutlieff, Ben J.; Bohn, Alexander J.; Birkby, Jayne L.; Kenworthy, Matthew A.; Morzinski, Katie M.; Doelman, David S.; Males, Jared R.; Snik, Frans; Close, Laird M.; Hinz, Philip M.; Charbonneau, David (2021). "High-contrast observations of brown dwarf companion HR 2562 B with the vector Apodizing Phase Plate coronagraph". Monthly Notices of the Royal Astronomical Society. 506 (3): 3224–3238. arXiv:2106.14890. Bibcode:2021MNRAS.506.3224S. doi:10.1093/mnras/stab1893.
