Direct Imaging Discovery of Giant Exoplanet β Pictoris d: A Decade-Long Game of Hide-and-Seek

We report the direct imaging discovery of a third exoplanet in the β Pictoris system. We detect β Pictoris d in non-coronagraphic observations obtained with VLT/ERIS as well as multi-epoch archival datasets from JWST/NIRCam and VLT/SPHERE.

Astrometric measurements over an 11-year baseline demonstrate that it is consistent with a gravitationally-bound source with orbital motion. Joint multi-planet orbit fits of all three planets in the system yield a semi-major axis of 26.0+2.2−6.1 au and inclination 89.0+0.7−0.6 deg for planet d.

β Pictoris d has a larger orbital semi-major axis than the other known planets in the system, but is coplanar with the inner two planets, and its orbit is consistent with sculpting the inner edge of the debris disk. β Pictoris d has a contrast of ΔL′=12.11±0.15 mag, with colors and luminosity that closely match those of 51 Eri b, another exoplanet in the β Pictoris moving group.

Its VLT/ERIS and JWST/NIRCam colors are distinct from those of free-floating planetary-mass objects of a similar age and temperature. Its red F410M−F444W color indicates strong CO₂ absorption in its atmosphere and suggests significant enhancement in metals compared to free-floating objects.

From the ATMO hot-start evolutionary models, we estimate an effective temperature of 600+45−60 K and mass of 2.4±0.6 M_Jup, which also closely matches similar estimates for 51 Eri b. β Pictoris d is among the lowest-mass exoplanets imaged from the ground.

This discovery highlights the deep sensitivity achievable with ground-based imaging in the mid-infrared and the discovery potential of future high-contrast observations with the Extremely Large Telescope.

Ben J. Sutlieff, Markus J. Bonse, Valentin Christiaens, Clémence Fontanive, Elisabeth C. Matthews, Luke T. Parker, Tim D. Pearce, Jayne L. Birkby, Beth A. Biller, Trent J. Dupuy, Emily O. Garvin, Leyla Iskandarli, Jens Kammerer, Yifan Zhou, Robert J. De Rosa, Aarynn L. Carter, Sasha Hinkley, Matthew A. Kenworthy, William O. Balmer, Iain Hammond, James Mang, Caroline V. Morley, Mark J. Neeser, Olivier Absil, Anthony Boccaletti, Mariangela Bonavita, Brendan P. Bowler, Xueqing Chen, Felix A. Dannert, Julien H. Girard, Markus Kasper, Anne-Marie Lagrange, Pengyu Liu, Gilles Orban de Xivry, Michael Poon, Sascha P. Quanz, Benoît Serra, Johanna M. Vos, Kevin Wagner, Jason Wang, Bernhard Schölkopf, Guido Agapito, Alex Agudo Berbel, Dániel Apai, Andrea Baruffolo, Martin Black, Marco Bonaglia, Runa Briguglio, Yixian Cao, Luca Carbonaro, Lee Chapman, Giovanni Cresci, Yigit Dallilar, Richard Davies, Matthias Deysenroth, Ivan Di Antonio, Amico Di Cianno, Gianluca Di Rico, David Doelman, Mauro Dolci, Frank Eisenhauer, Simone Esposito, Debora Ferruzzi, Helmut Feuchtgruber, Natascha Förster-Schreiber, Kyle Franson, Reinhard Genzel, Stefan Gillessen, Eileen C. Gonzales, Michael Hartl, Jean Hayoz, Heinrich Huber, Christoph Keller, Kateryna Kravchenko, Jarron Leisenring, John Lightfoot, David Lunney, Dieter Lutz, Mike Macintosh, Filippo Mannucci, Stanimir Metchev, Thomas Ott, David Pearson, Alfio Puglisi, Sebastian Rabien, Christian Rau, Armando Riccardi, Bernardo Salasnich, Taro Shimizu, Frans Snik, Eckhard Sturm, Genaro Suárez, Linda Tacconi, Xianyu Tan, William Taylor, Christopher Waring, Marco Xompero

Comments: 27 pages, 8 figures, accepted for publication in ApJ Letters. This article is embargoed for discussion in the press until formal publication in ApJ Letters; press releases are pending
Subjects: Earth and Planetary Astrophysics (astro-ph.EP); Instrumentation and Methods for Astrophysics (astro-ph.IM); Solar and Stellar Astrophysics (astro-ph.SR)
Cite as: arXiv:2606.23801 [astro-ph.EP] (or arXiv:2606.23801v1 [astro-ph.EP] for this version)
https://doi.org/10.48550/arXiv.2606.23801
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Submission history
From: Ben Sutlieff
[v1] Mon, 22 Jun 2026 18:00:04 UTC (1,658 KB)
https://arxiv.org/abs/2606.23801
Astrobiology, Astronomy, exoplanet,