New Orbital Constraints for YSES 1 b and HR 2562 B from High-Precision Astrometry and Planetary Radial Velocities
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| author | 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 |
| author_facet | 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 |
| contents | We present new VLTI/GRAVITY astrometry and updated orbit fits for the directly imaged companions YSES 1 b and HR 2562 B, substellar objects straddling the planet-brown dwarf boundary. Using high-precision astrometry, radial velocity (RV) data, and proper motions, we derive revised orbital parameters with orbitize! arXiv:1910.01756. For YSES 1 b, the inclusion of GRAVITY astrometry and a relative radial velocity measurement from arXiv:2409.16660 overcomes the traditional challenge of constraining eccentricities for distant companions, enabling the first orbit fit and yielding a constrained eccentricity of 0.44 (0.20). This represents the first full orbit fit for the system. Additionally, we calculate a median line-of-sight stellar obliquity of 12 (+11, -8) degrees, providing further insight into the system's dynamical architecture. For HR 2562 B, our analysis agrees with arXiv:2302.04893, confirming a low-eccentricity orbit (0.34 (0.20)) and an inclination of 87 (1) degrees. We find HR 2562 B's orbit to be nearly coplanar with the debris disk, with a mutual inclination of 3.7 (0.3) degrees. For both YSES 1 b and HR 2562 B the lower eccentricities favor an in situ formation scenario over extreme scattering or cloud fragmentation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_14321 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | New Orbital Constraints for YSES 1 b and HR 2562 B from High-Precision Astrometry and Planetary Radial Velocities 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 Earth and Planetary Astrophysics We present new VLTI/GRAVITY astrometry and updated orbit fits for the directly imaged companions YSES 1 b and HR 2562 B, substellar objects straddling the planet-brown dwarf boundary. Using high-precision astrometry, radial velocity (RV) data, and proper motions, we derive revised orbital parameters with orbitize! arXiv:1910.01756. For YSES 1 b, the inclusion of GRAVITY astrometry and a relative radial velocity measurement from arXiv:2409.16660 overcomes the traditional challenge of constraining eccentricities for distant companions, enabling the first orbit fit and yielding a constrained eccentricity of 0.44 (0.20). This represents the first full orbit fit for the system. Additionally, we calculate a median line-of-sight stellar obliquity of 12 (+11, -8) degrees, providing further insight into the system's dynamical architecture. For HR 2562 B, our analysis agrees with arXiv:2302.04893, confirming a low-eccentricity orbit (0.34 (0.20)) and an inclination of 87 (1) degrees. We find HR 2562 B's orbit to be nearly coplanar with the debris disk, with a mutual inclination of 3.7 (0.3) degrees. For both YSES 1 b and HR 2562 B the lower eccentricities favor an in situ formation scenario over extreme scattering or cloud fragmentation. |
| title | New Orbital Constraints for YSES 1 b and HR 2562 B from High-Precision Astrometry and Planetary Radial Velocities |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2509.14321 |