OASIS Survey Direct Imaging and Astrometric Discovery of HIP 71618 B: A Substellar Companion Suitable for the Roman Coronagraph Technology Demonstration
Abstrak
We present the OASIS survey program discovery of a substellar companion orbiting the young A1V star HIP 71618, detected using precision astrometry from Gaia and Hipparcos and high-contrast imaging with SCExAO/CHARIS and Keck/NIRC2. Atmospheric modeling favors a spectral type of M5--M8 and a temperature of $\sim$2700 $\pm$ 100 $K$. Dynamical modeling constrains HIP 71618 B's mass to be ${60}_{-21}^{+27}$ $M_{\rm Jup}$ or ${65}_{-29}^{+54}$ $M_{\rm Jup}$, depending on the adopted companion mass prior. It has a nearly edge-on, 11 au-orbit with a high eccentricity. HIP 71618 B will be located within Roman Coronagraph's dark hole region during the instrument's technological demonstration phase. A high signal-to-noise ratio detection of HIP 71618 B at 575 nm would demonstrate a 5-$σ$ contrast of 10$^{-7}$ or better. The system is also located within or very close to Roman's Continuous Viewing Zone -- near multiple candidate reference stars for dark-hole digging -- and its primary is bright ($V$ $\approx$ 5). The suitability of HIP 71618 as one potential Roman Coronagraph target for demonstrating the instrument's core requirement (TTR5) should motivate the timely, deep vetting of candidate reference stars.
Topik & Kata Kunci
Penulis (30)
Mona El Morsy
Thayne Currie
Brianna Lacy
Taylor L. Tobin
Qier An
Yiting Li
Ziying Gu
Masayuki Kuzuhara
Danielle Bovie
Dillon Peng
Jeffrey Chilcote
Olivier Guyon
Timothy D. Brandt
Robert J. De Rosa
Vincent Deo
Tyler D. Groff
Markus Janson
N. Jeremy Kasdin
Julien Lozi
Christian Marois
Bertrand Mennesson
Naoshi Murakami
Eric Nielsen
Sabina Sagynbayeva
Nour Skaf
William Thompson
Motohide Tamura
Taichi Uyama
Sébastien Vievard
Alice Zurlo
Akses Cepat
- Tahun Terbit
- 2025
- Bahasa
- en
- Sumber Database
- arXiv
- Akses
- Open Access ✓