Brandt, M. et al. Improved dynamical masses for six brown dwarf companions using Hipparcos and Gaia EDR3. Astron. J. 162, 301 (2021).
Cheetham, A. et al. Direct imaging of an ultracool substellar companion to the exoplanet host star HD 4113 A. Astron. Astrophys. 680, A64 (2018).
Li, Y. et al. Surveying nearby brown dwarfs with HGCA: direct imaging discovery of a faint, high-mass brown dwarf orbiting HD 176535 A. Mon. Not. R. Astron. Soc. 522, 5622â5637 (2023).
Howe, A. R., Mandell, A. M. & McElwain, M. W. Investigating possible binarity for GJ 229B. Astrophys. J. Lett. 951, L25 (2023).
Nakajima, T. et al. Discovery of a cool brown dwarf. Nature 378, 463â465 (1995).
Oppenheimer, B. R. et al. Infrared spectrum of the cool brown dwarf Gl 229B. Science 270, 1478â1479 (1995).
Filippazzo, J. C. et al. Fundamental parameters and spectral energy distributions of young and field age objects with masses spanning the stellar to planetary regime. Astrophys. J. 810, 158 (2015).
Saumon, D. & Marley, M. S. The evolution of L and T dwarfs in color-magnitude diagrams. Astrophys. J. 689, 1327 (2008).
Phillips, M. W. et al. A new set of atmosphere and evolution models for cool TâY brown dwarfs and giant exoplanets. Astron. Astrophys. 637, A38 (2020).
Oppenheimer, B. R., Kulkarni, S. R., & Stauffer, J. R. in Protostars and Planets IV (eds Mannings, V. Boss, A. P. & Russell, S. S.) 1313 (Univ. Arizona Press, 2000).
Morley, C. V. et al. The Sonora substellar atmosphere models. III. Diamondback: atmospheric properties, spectra, and evolution for warm cloudy substellar objects. Preprint at https://arxiv.org/abs/2402.00758 (2024).
Burgasser, A. J., Geballe, T. R., Leggett, S. K., Kirkpatrick, J. D. & Golimowski, D. A. A unified near-infrared spectral classification scheme for T dwarfs. Astrophys. J. 637, 1067 (2006).
Brandt, T. D. et al. A dynamical mass of 70 ± 5 MJup for Gliese 229B, the first T dwarf. Astron. J. 160, 196 (2020).
Gaia Collaboration. Gaia Data Release 3. Summary of the content and survey properties. Astron. Astrophys. 674, A1 (2023).
Burgasser, A. J. et al. in Protostars and Planets V (eds Reipurth, B. Jewitt, D. & Keil, K.) 427 (Univ. Arizona Press, 2007).
Fontanive, C., Biller, B., Bonavita, M. & Allers, K. Constraining the multiplicity statistics of the coolest brown dwarfs: binary fraction continues to decrease with spectral type. Mon. Not. R. Astron. Soc. 479, 2702â2727 (2018).
GRAVITY+ Collaboration et al. First light for GRAVITY Wide. Large separation fringe tracking for the Very Large Telescope Interferometer. Astron. Astrophys. 665, A75 (2022).
Dorn, R. J. et al. CRIRES+ on sky at the ESO Very Large Telescope. Observing the Universe at infrared wavelengths and high spectral resolution. Astron. Astrophys. 671, A24 (2023).
Gallenne, A. et al. Robust high-contrast companion detection from interferometric observations. The CANDID algorithm and an application to six binary Cepheids. Astron. Astrophys. 579, A68 (2015).
Mukherjee, S. et al. The Sonora substellar atmosphere models. IV. Elf Owl: atmospheric mixing and chemical disequilibrium with varying metallicity and C/O ratios. Astrophys. J. 963, 73 (2024).
Calamari, E. et al. An atmospheric retrieval of the brown dwarf Gliese 229B. Astrophys. J. 940, 164 (2022).
Mérand, A. Flexible spectro-interferometric modelling of OIFITS data with PMOIRED. Proc. SPIE 12183, 121831N (2022).
Thompson, W. et al. Octofitter: fast, flexible, and accurate orbit modeling to detect exoplanets. Astron. J. 166, 164 (2023).
Dupuy, T. J. & Liu, M. C. Individual dynamical masses of ultracool dwarfs. Astrophys. J. Suppl. Ser. 231, 15 (2017).
Bowler, B. P. et al. Rotation periods, inclinations, and obliquities of cool stars hosting directly imaged substellar companions: spinâorbit misalignments are common. Astron. J. 165, 164 (2023).
Chabrier, G., Baraffe, I., Phillips, M. & Debras, F. Impact of a new H/He equation of state on the evolution of massive brown dwarfs. New determination of the hydrogen burning limit. Astron. Astrophys. 671, A119 (2023).
Hsu, C.-C., Burgasser, A. J. & Theissen, C. A. Discovery of the exceptionally short period ultracool dwarf binary LP 413-53AB. Astrophys. J. Lett. 945, L6 (2023).
Lodieu, N. et al. An eclipsing double-line spectroscopic binary at the stellar/substellar boundary in the Upper Scorpius OB association. Astron. Astrophys. 584, A128 (2015).
Stassun, K. G., Mathieu, R. D. & Valenti, J. A. Discovery of two young brown dwarfs in an eclipsing binary system. Nature 440, 311â314 (2006).
Triaud, A. H. M. J. et al. An eclipsing substellar binary in a young triple system discovered by SPECULOOS. Nat. Astron. 4, 650â657 (2020).
Low, C. & Lynden-Bell, D. The minimum Jeans mass or when fragmentation must stop. Mon. Not. R. Astron. Soc. 176, 367â390 (1976).
Burgasser, A. J. et al. Discovery of a very low mass triple with late-M and T dwarf components: LP 704-48/SDSS J0006-0852AB. Astrophys. J. 757, 110 (2012).
Stamatellos, D. & Whitworth, A. P. The properties of brown dwarfs and low-mass hydrogen-burning stars formed by disc fragmentation. Mon. Not. R. Astron. Soc. 392, 413â427 (2009).
Lazzoni, C., Rice, K., Zurlo, A., Hinkley, S. & Desidera, S. Binary planet formation through tides. Mon. Not. R. Astron. Soc. 527, 3837â3846 (2024).
Best, W. M. J., Liu, M. C., Dupuy, T. J. & Magnier, E. A. The young L dwarf 2MASS J11193254â1137466 is a planetary-mass binary. Astrophys. J. Lett. 843, L4 (2017).
Theissen, C. A. et al. WISE J135501.90-825838.9 is a nearby, young, extremely low-mass substellar binary. Res. Notes AAS 4, 67 (2020).
Bowler, B. P. & Hillenbrand, L. A. Near-infrared spectroscopy of 2M0441+2301 AabBab: a quadruple system spanning the stellar to planetary mass regimes. Astrophys. J. Lett. 811, L30 (2015).
Chauvin, G. et al. A giant planet candidate near a young brown dwarf. Direct VLT/NACO observations using IR wavefront sensing. Astron. Astrophys. 425, L29 (2004).
Calissendorff, P. et al. JWST/NIRCam discovery of the first Y+Y brown dwarf binary: WISE J033605.05-014350.4. Astrophys. J. Lett. 947, L30 (2023).
GRAVITY Collaboration et al. First light for GRAVITY: phase referencing optical interferometry for the Very Large Telescope Interferometer. Astron. Astrophys. 602, A94 (2017).
Eisenhauer, F. GRAVITY+: towards faint science. The Very Large Telescope in 2030 (VLT2030). Zenodo https://doi.org/10.5281/zenodo.3356274 (2019).
Lacour, S. et al. The GRAVITY fringe tracker. Astron. Astrophys. 624, A99 (2019).
Nowak, M. et al. Upgrading the GRAVITY fringe tracker for GRAVITY+. Tracking the white-light fringe in the non-observable optical path length state-space. Astron. Astrophys. 684, A184 (2024).
Lapeyrere, V. et al. GRAVITY data reduction software. Proc. SPIE 9146, 91462D (2014).
Lacour, S., Carrión-González, Ã., & Nowak, M. Exoplanets in reflected starlight with dual-field interferometry: a case for shorter wavelengths and a fifth Unit Telescope at VLTI/Paranal. Preprint at https://arxiv.org/abs/2406.07030 (2024).
Dorn, R. J. et al. CRIRES+: exploring the cold universe at high spectral resolution. The Messenger 156, 7â11 (2014).
Zhang, Y. excalibuhr. GitHub https://github.com/yapenzhang/excalibuhr (2024)
Horne, K. An optimal extraction algorithm for CCD spectroscopy. Publ. Astron. Soc. Pac. 98, 609 (1986).
Noll, S. et al. An atmospheric radiation model for Cerro Paranal. I. The optical spectral range. Astron. Astrophys. 543, A92 (2012).
Jones, A., Noll, S., Kausch, W., Szyszka, C. & Kimeswenger, S. An advanced scattered moonlight model for Cerro Paranal. Astron. Astrophys. 560, A91 (2013).
Smette, A. et al. Molecfit: a general tool for telluric absorption correction. Astron. Astrophys. 576, A77 (2015).
Geballe, T. R., Kulkarni, S. R., Woodward, C. E. & Sloan, G. C. The near-infrared spectrum of the brown dwarf Gliese 229B. Astrophys. J. Lett. 467, L101 (1996).
Hargreaves, R. J. et al. An accurate, extensive, and practical line list of methane for the HITEMP database. Astrophys. J. Suppl. Ser. 247, 55 (2020).
Tannock, M. E. et al. A 1.46â2.48 μm spectroscopic atlas of a T6 dwarf (1060 K) atmosphere with IGRINS: first detections of H2S and H2, and verification of H2O, CH4, and NH3 line lists. Mon. Not. R. Astron. Soc. 514, 3160â3178 (2022).
Polyansky, O. L. et al. ExoMol molecular line lists XXX: a complete high-accuracy line list for water. Mon. Not. R. Astron. Soc. 480, 2597â2608 (2018).
Mollière, P. et al. petitRADTRANS. A Python radiative transfer package for exoplanet characterization and retrieval. Astron. Astrophys. 627, A67 (2019).
Ruffio, J.-B. et al. Detecting exomoons from radial velocity measurements of self-luminous planets: application to observations of HR 7672 B and future prospects. Astron. J. 165, 113 (2023).
Carvalho, A. & Johns-Krull, C. M. A simple code for rotational broadening of broad wavelength range high-dispersion spectra. Res. Notes AAS 7, 91 (2023).
Speagle, J. S. DYNESTY: a dynamic nested sampling package for estimating Bayesian posteriors and evidences. Mon. Not. R. Astron. Soc. 493, 3132â3158 (2020).
Astropy Collaboration et al. The Astropy Project: sustaining and growing a community-oriented open-source project and the latest major release (v5.0) of the core package. Astrophys. J. 935, 167 (2022).
Fouqué, P. et al. SPIRou Input Catalogue: global properties of 440 M dwarfs observed with ESPaDOnS at CFHT. Mon. Not. R. Astron. Soc. 475, 1960â1986 (2018).
Neves, V. et al. Metallicity of M dwarfs. III. Planet-metallicity and planet-stellar mass correlations of the HARPS GTO M dwarf sample. Astron. Astrophys. 551, A36 (2013).
Kuznetsov, M. K., del Burgo, C., Pavlenko, Y. V. & Frith, J. Characterization of a sample of southern M dwarfs using HARPS and X-shooter spectra. Astrophys. J. 878, 134 (2019).
Nakajima, T., Tsuji, T. & Takeda, Y. Physical properties of Gliese 229B based on newly determined carbon and oxygen abundances of Gliese 229A. Astron. J. 150, 53 (2015).
Husser, T.-O. et al. A new extensive library of PHOENIX stellar atmospheres and synthetic spectra. Astron. Astrophys. 553, A6 (2013).
Leggett, S. K. et al. Infrared photometry of late-M, L, and T dwarfs. Astrophys. J. 564, 452 (2002).
Foreman-Mackey, D., Hogg, D. W., Lang, D. & Goodman, J. emcee: the MCMC hammer. Publ. Astron. Soc. Pac. 125, 306 (2013).
Sanghi, A. et al. The Hawaii Infrared Parallax Program. VI. The fundamental properties of 1000+ ultracool dwarfs and planetary-mass objects using optical to mid-infrared spectral energy distributions and comparison to BT-Settl and ATMO 2020 model atmospheres. Astrophys. J. 959, 63 (2023).
Gallenne, A. et al. The Araucaria project: high-precision orbital parallaxes and masses of binary stars. I. VLTI/GRAVITY observations of ten double-lined spectroscopic binaries. Astron. Astrophys. 672, A119 (2023).
Lachaume, R. et al. Towards reliable uncertainties in IR interferometry: the bootstrap for correlated statistical and systematic errors. Mon. Not. R. Astron. Soc. 484, 2656â2673 (2019).
Kammerer, J., Mérand, A., Ireland, M. J. & Lacour, S. Increasing the achievable contrast of infrared interferometry with an error correlation model. Astron. Astrophys. 644, A110 (2020).
Syed, S., Bouchard-Côté, A., Deligiannidis, G. & Doucet, A. Non-reversible parallel tempering: a scalable highly parallel MCMC scheme. J. R. Stat. Soc. B Stat. Methodol. 84, 321â350 (2022).
Surjanovic, N. et al. Pigeons.jl: distributed sampling from intractable distributions. Preprint at https://arxiv.org/abs/2308.09769 (2023).
Biron-Lattes, M., Surjanovic, N., Syed, S., Campbell, T. & Bouchard-Cote, A. in Proc. 27th International Conference on Artificial Intelligence and Statistics 4600â4608 (MLR Press, 2024).
Surjanovic, N., Syed, S., Bouchard-Côté, A. & Campbell, T. Parallel tempering with a variational reference. In Advances in Neural Information Processing Systems NeurIPS 35 565â577 (Curran Associates, Inc., 2022).
Blackburn, L. et al. Closure statistics in interferometric data. Astrophys. J. 894, 31 (2020).
Peale, S. J. in Planetary Satellites (ed. Burns, J. A.) 87â111 (Univ. Arizona Press, 1977).
Naoz, S. The eccentric Kozai-Lidov effect and its applications. Annu. Rev. Astron. Astrophys. 54, 441â489 (2016).
Batygin, K., Bodenheimer, P. & Laughlin, G. Determination of the interior structure of transiting planets in multiple-planet systems. Astrophys. J. Lett. 704, L49 (2009).
Efroimsky, M. & Makarov, V. V. Tidal quality of the hot Jupiter WASP-12b. Universe 8, 211 (2022).
Xuan, J., Thompson, W., Lacour, S., Blakely, D. & Mérand, A. GRAVITY and CRIRES+ data for Gliese 229Bab Zenodo https://doi.org/10.5281/zenodo.13851639 (2024).
Dupuy, T. J. & Liu, M. C. The Hawaii Infrared Parallax Program. I. Ultracool binaries and the L/T transition. Astrophys. J. Suppl. Ser. 201, 19 (2012).
Dupuy, T. J. & Kraus, A. L. Distances, luminosities, and temperatures of the coldest known substellar objects. Science 341, 1492â1495 (2013).
Deacon, N. R. et al. Wide cool and ultracool companions to nearby stars from Pan-STARRS 1. Astrophys. J. 792, 119 (2014).
Liu, M. C., Dupuy, T. J. & Allers, K. N. The Hawaii Infrared Parallax Program. II. Young ultracool field dwarfs. Astrophys. J. 833, 96 (2016).
Best, W. M. J. et al. Photometry and proper motions of M, L, and T dwarfs from the Pan-STARRS1 3Ï survey. Astrophys. J. Suppl. Ser. 234, 1 (2018).
Best, W. M. J., Liu, M. C., Magnier, E. A. & Dupuy, T. J. A volume-limited sample of ultracool dwarfs. I. Construction, space density, and a gap in the L/T transition. Astron. J. 161, 42 (2021).
Schneider, A. C. et al. Astrometry and photometry for â1000 L, T, and Y dwarfs from the UKIRT Hemisphere Survey. Astron. J. 166, 103 (2023).
Allard, F., Hauschildt, P. H., Alexander, D. R., Tamanai, A. & Schweitzer, A. The limiting effects of dust in brown dwarf model atmospheres. Astrophys. J. 556, 357 (2001).
Golimowski, D. A. et al. The Solar neighborhood. IX. Hubble Space Telescope detections of companions to five M and L dwarfs within 10 parsecs of the Sun. Astron. J. 128, 1733 (2004).
Burgasser, A. J., Kirkpatrick, J. D. & Lowrance, P. J. Multiplicity among widely separated brown dwarf companions to nearby stars: Gliese 337CD. Astrophys. J. 129, 2849 (2005).
Dupuy, T. J., Liu, M. C. & Ireland, M. J. New evidence for a substellar luminosity problem: dynamical mass for the brown dwarf binary Gl 417BC. Astrophys. J. 790, 133 (2014).
Dupuy, T. J., Liu, M. C. & Ireland, M. J. Dynamical mass of the substellar benchmark binary HD 130948BC. Astrophys. J. 692, 729 (2009).
Nielsen, E. L. et al. The Gemini NICI Planet-Finding Campaign: the frequency of giant planets around young B and A stars. Astrophys. J. 776, 4 (2013).
Chen, M. et al. Precise dynamical masses of É Indi Ba and Bb: evidence of slowed cooling at the L/T transition. Astron. J. 163, 288 (2022).
Radigan, J. et al. Discovery of a visual T-dwarf triple system and binarity at the L/T transition. Astrophys. J. 778, 36 (2013).
