SCExAO/CHARIS and Gaia Direct Imaging and Astrometric Discovery of a Superjovian Planet 3--4 lambda/D from the Accelerating Star HIP 54515

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Main Authors:	Currie, Thayne, Li, Yiting, Morsy, Mona El, Lacy, Brianna, Vincent, Maria, Tobin, Taylor L., Kuzuhara, Masayuki, Chilcote, Jeffrey, Guyon, Olivier, Gu, Ziying, Bovie, Danielle, Peng, Dillon, An, Qier, Brandt, Timothy D., De Rosa, Robert J., Deo, Vincent, Groff, Tyler D., Janson, Markus, Kasdin, N. Jeremy, Lozi, Julien, Marois, Christian, Mennesson, Bertrand, Murakami, Naoshi, Nielsen, Eric, Sagynbayeva, Sabina, Skaf, Nour, Thompson, William, Tamura, Motohide, Uyama, Taichi, Vievard, Sébastien, Zurlo, Alice
Format:	Preprint
Published:	2025
Subjects:	Earth and Planetary Astrophysics Instrumentation and Methods for Astrophysics Solar and Stellar Astrophysics
Online Access:	Acceder al recurso
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_version_	1866908695318757376
author	Currie, Thayne Li, Yiting Morsy, Mona El Lacy, Brianna Vincent, Maria Tobin, Taylor L. Kuzuhara, Masayuki Chilcote, Jeffrey Guyon, Olivier Gu, Ziying Bovie, Danielle Peng, Dillon An, Qier Brandt, Timothy D. De Rosa, Robert J. Deo, Vincent Groff, Tyler D. Janson, Markus Kasdin, N. Jeremy Lozi, Julien Marois, Christian Mennesson, Bertrand Murakami, Naoshi Nielsen, Eric Sagynbayeva, Sabina Skaf, Nour Thompson, William Tamura, Motohide Uyama, Taichi Vievard, Sébastien Zurlo, Alice
author_facet	Currie, Thayne Li, Yiting Morsy, Mona El Lacy, Brianna Vincent, Maria Tobin, Taylor L. Kuzuhara, Masayuki Chilcote, Jeffrey Guyon, Olivier Gu, Ziying Bovie, Danielle Peng, Dillon An, Qier Brandt, Timothy D. De Rosa, Robert J. Deo, Vincent Groff, Tyler D. Janson, Markus Kasdin, N. Jeremy Lozi, Julien Marois, Christian Mennesson, Bertrand Murakami, Naoshi Nielsen, Eric Sagynbayeva, Sabina Skaf, Nour Thompson, William Tamura, Motohide Uyama, Taichi Vievard, Sébastien Zurlo, Alice
contents	We present the discovery of a superjovian planet around the young A5 star HIP 54515, detected using precision astrometry from the Hipparcos Gaia Catalogue of Accelerations and high-contrast imaging with SCExAO/CHARIS from the recently-commenced OASIS program. SCExAO/CHARIS detects HIP 54515 b in five epochs 0\farcs{}145--0\farcs{}192 from the star ($\sim$3--4 $λ$/D at 1.65 $μm$), exhibiting clockwise orbital motion. HIP 54515 b lies near the M/L transition with a luminosity of log(L/L$_{\rm \odot}$) $\sim$ -3.52 $\pm$ 0.03. Dynamical modeling constrains its mass and mass ratio to be ${17.7}_{-4.9}^{+7.6}$ $M_{\rm Jup}$ and ${0.0090}_{-0.0024}^{+0.0036}$ and favors a $\sim$25 au semimajor axis. HIP 54515 b adds to a growing list of superjovian planets with moderate eccentricities (e $\approx$ 0.4). Now the third planet discovered from surveys combining high-contrast extreme adaptive optics imaging with precision astrometry, HIP 54515 b should help improve empirical constraints on the luminosity evolution and eccentricity distribution of the most massive planets. It may also provide a key technical test of the Roman Space Telescope Coronagraph Instrument's performance in the low stellar flux, small angular separation limit and a demonstration of its ability to yield constrainable planet spectral properties.
format	Preprint
id	arxiv_https___arxiv_org_abs_2512_02159
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	SCExAO/CHARIS and Gaia Direct Imaging and Astrometric Discovery of a Superjovian Planet 3--4 lambda/D from the Accelerating Star HIP 54515 Currie, Thayne Li, Yiting Morsy, Mona El Lacy, Brianna Vincent, Maria Tobin, Taylor L. Kuzuhara, Masayuki Chilcote, Jeffrey Guyon, Olivier Gu, Ziying Bovie, Danielle Peng, Dillon An, Qier Brandt, Timothy D. De Rosa, Robert J. Deo, Vincent Groff, Tyler D. Janson, Markus Kasdin, N. Jeremy Lozi, Julien Marois, Christian Mennesson, Bertrand Murakami, Naoshi Nielsen, Eric Sagynbayeva, Sabina Skaf, Nour Thompson, William Tamura, Motohide Uyama, Taichi Vievard, Sébastien Zurlo, Alice Earth and Planetary Astrophysics Instrumentation and Methods for Astrophysics Solar and Stellar Astrophysics We present the discovery of a superjovian planet around the young A5 star HIP 54515, detected using precision astrometry from the Hipparcos Gaia Catalogue of Accelerations and high-contrast imaging with SCExAO/CHARIS from the recently-commenced OASIS program. SCExAO/CHARIS detects HIP 54515 b in five epochs 0\farcs{}145--0\farcs{}192 from the star ($\sim$3--4 $λ$/D at 1.65 $μm$), exhibiting clockwise orbital motion. HIP 54515 b lies near the M/L transition with a luminosity of log(L/L$_{\rm \odot}$) $\sim$ -3.52 $\pm$ 0.03. Dynamical modeling constrains its mass and mass ratio to be ${17.7}_{-4.9}^{+7.6}$ $M_{\rm Jup}$ and ${0.0090}_{-0.0024}^{+0.0036}$ and favors a $\sim$25 au semimajor axis. HIP 54515 b adds to a growing list of superjovian planets with moderate eccentricities (e $\approx$ 0.4). Now the third planet discovered from surveys combining high-contrast extreme adaptive optics imaging with precision astrometry, HIP 54515 b should help improve empirical constraints on the luminosity evolution and eccentricity distribution of the most massive planets. It may also provide a key technical test of the Roman Space Telescope Coronagraph Instrument's performance in the low stellar flux, small angular separation limit and a demonstration of its ability to yield constrainable planet spectral properties.
title	SCExAO/CHARIS and Gaia Direct Imaging and Astrometric Discovery of a Superjovian Planet 3--4 lambda/D from the Accelerating Star HIP 54515
topic	Earth and Planetary Astrophysics Instrumentation and Methods for Astrophysics Solar and Stellar Astrophysics
url	https://arxiv.org/abs/2512.02159