Improving constraints on the Yukawa correction at the Galactic Center with multiple stellar orbits

@misc{foschi2026improving,
  title = {{Improving constraints on the Yukawa correction at the Galactic Center with multiple stellar orbits}},
  author = {A Foschi and K Abd El Dayem and N Aimar and A Berdeu and J.-P Berger and G Bourdarot and W Brandner and Y Cao and C Correia and S. Cueves Cardona and R Davies and D Defrère and F Delplancke-Ströbele and A Drescher and F Eisenhauer and L. Esteras Otal and M Fabricius and H Feuchtgruber and S Flesch and N.M. Förster Schreiber and Q Fournier and P Garcia and R. Garcia Lopez and R Genzel and S Gillessen and F Gonté and X Haubois and S.F Hönig and M Houllé and S Joharle and J Kammerer and A Kaufer and P Kervella and L Kreidberg and L Labadie and S Lacour and O Lai and R Laugier and J.-B Le Bouquin and J Leftley and R Li and B Lopez and D Lutz and F Mang and A Mérand and F Millour and M Montargès and N Morujão and H Nowacki and M Nowak and J Osorno and T Ott and S Pappert and C Paladini and T Paumard and K Perraut and G Perrin and R Petrov and N Pourré and S Rabien},
  howpublished = {HAL},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.07693},
  eprint = {2609.07693},
  archivePrefix = {arXiv},
  url = {https://hal.science/hal-05761038v1},
  note = {CC BY 4.0},
}

TY  - UNPB
TI  - Improving constraints on the Yukawa correction at the Galactic Center with multiple stellar orbits
AU  - A Foschi
AU  - K Abd El Dayem
AU  - N Aimar
AU  - A Berdeu
AU  - J.-P Berger
AU  - G Bourdarot
AU  - W Brandner
AU  - Y Cao
AU  - C Correia
AU  - S. Cueves Cardona
AU  - R Davies
AU  - D Defrère
AU  - F Delplancke-Ströbele
AU  - A Drescher
AU  - F Eisenhauer
AU  - L. Esteras Otal
AU  - M Fabricius
AU  - H Feuchtgruber
AU  - S Flesch
AU  - N.M. Förster Schreiber
AU  - Q Fournier
AU  - P Garcia
AU  - R. Garcia Lopez
AU  - R Genzel
AU  - S Gillessen
AU  - F Gonté
AU  - X Haubois
AU  - S.F Hönig
AU  - M Houllé
AU  - S Joharle
AU  - J Kammerer
AU  - A Kaufer
AU  - P Kervella
AU  - L Kreidberg
AU  - L Labadie
AU  - S Lacour
AU  - O Lai
AU  - R Laugier
AU  - J.-B Le Bouquin
AU  - J Leftley
AU  - R Li
AU  - B Lopez
AU  - D Lutz
AU  - F Mang
AU  - A Mérand
AU  - F Millour
AU  - M Montargès
AU  - N Morujão
AU  - H Nowacki
AU  - M Nowak
AU  - J Osorno
AU  - T Ott
AU  - S Pappert
AU  - C Paladini
AU  - T Paumard
AU  - K Perraut
AU  - G Perrin
AU  - R Petrov
AU  - N Pourré
AU  - S Rabien
PY  - 2026
DA  - 2026/09/09
PB  - HAL
DO  - 10.48550/arxiv.2609.07693
UR  - https://hal.science/hal-05761038v1
AB  - We investigate the presence of a Yukawa-like correction (∝ αe^− r/λ) to Newtonian gravity at the Galactic Center, using a multi-star fitting code, including the newly discovered star S$301$, to improve the constraints obtained using S$2$ orbit alone. We perform a Markov Chain Monte Carlo analysis using the astrometric and spectroscopic data of stars S$2$, S$55$, S$29$, S$38$ and S$301$ collected by GRAVITY, GRAVITY^+, NACO and SINFONI instruments, covering the period from $1992$ to $2025$. Compared to GRAVITY Collaboration 2025 (Paper I), in which only S$2$ was fitted, the tightest bound on the Yukawa coupling is again reached at λ= 3·10^13 m (∼ 200 AU), where we find |α| < 6 ·10^−4, an improvement of roughly a factor five. The addition of S$301$ extends the constraint to short ranges that were inaccessible to S$2$, yielding |α| < 0.004 at λ=10^12 m and |α| < 0.006 at λ=5· 10^11 m, while S$29$, with its larger apoapsis, gives |α| < 0.1 at λ∼ 2·10^15 m. The latter two represent the tightest limits at these scale lengths on a Yukawa correction obtained to date around a supermassive black hole.
ER  -