MINDS. Anatomy of a water-rich, inclined, brown dwarf disk: lack of abundant hydrocarbons
MINDS. Anatomy of a water-rich, inclined, brown dwarf disk: lack of abundant hydrocarbons
2MASS J04381486+2611399 (or J0438) is one of the few young brown dwarfs (BD) with a highly inclined ($i\!\sim\!70^\circ$) disk. Here we report results from JWST-MIRI MRS, HST-ACS and ALMA Band 7 observations. Despite its late spectral type (M7.25), the spectrum of J0438 resembles those of inner disks around earlier-type stars (K1-M5, T Tauri stars), with a volatile reservoir lacking hydrocarbons (except for acetylene, C$_2$H$_2$) and dominated by water. Other identified species are H$_2$, CO$_2$, HCN, [Ar$^{+}$], and [Ne$^{+}$]. The dominance of water over hydrocarbons is driven by multiple factors such as disk dynamics, young disk age, low accretion rate and possible inner disk clearing. J0438 appears highly dynamic, showing a seesaw-like variability and extended emission in H$_2 \,\,\, S$(1), $S$(3), $S$(5), [Ne$^{+}$] and CO ($J=3-2$). Interestingly, the CO emission reaches up to 400 au from the brown dwarf, suggesting ongoing infalling/outflowing activity impacting the disk chemistry. These observations underscore the combined power of JWST, HST and ALMA in characterizing the chemical diversity and dynamics of brown dwarf disks.
Giulia Perotti、Nicolás T. Kurtovic、Thomas Henning、G?ran Olofsson、Aditya M. Arabhavi、Kamber Schwarz、Jayatee Kanwar、Roy van Boekel、Inga Kamp、Ilaria Pascucci、Ewine F. van Dishoeck、Manuel Güdel、Pierre-Olivier Lagage、David Barrado、Alessio Caratti o Garatti、Adrian M. Glauser、F. Lahuis、Valentin Christiaens、Riccardo Franceschi、Danny Gasman、Sierra L. Grant、Hyerin Jang、Till Kaeufer、Maria Morales-Calderón、Milou Temmink、Marissa Vlasblom
Max-Planck-Institut für Astronomie, Heidelberg, GermanyMax-Planck Institut für Extraterrestrische PhysikMax-Planck-Institut für Astronomie, Heidelberg, GermanyDepartment of Astronomy, Stockholm University, AlbaNova University Center, Stockholm, SwedenKapteyn Astronomical Institute, Rijksuniversiteit Groningen, Groningen, The NetherlandsMax-Planck-Institut für Astronomie, Heidelberg, GermanyKapteyn Astronomical Institute, Rijksuniversiteit Groningen, Groningen, The NetherlandsMax-Planck-Institut für Astronomie, Heidelberg, GermanyKapteyn Astronomical Institute, Rijksuniversiteit Groningen, Groningen, The NetherlandsLunar and Planetary Laboratory, The University of Arizona, Tucson, USALeiden Observatory, Leiden University, Leiden, the NetherlandsDept. of Astrophysics, University of Vienna, Vienna, AustriaUniversité Paris-Saclay, Université Paris Cité, CEA, CNRS, AIM, Gif-sur-Yvette, FranceCentro de Astrobiología, CSIC-INTA, Madrid, SpainINAF - Osservatorio Astronomico di Capodimonte, Napoli, ItalyETH Zürich, Institute for Particle Physics and Astrophysics, Zürich, SwitzerlandSRON Netherlands Institute for Space Research, Groningen, The NetherlandsInstitute of Astronomy, KU Leuven, Leuven, BelgiumLESIA, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, Université de Paris, Meudon, FranceInstitute of Astronomy, KU Leuven, Leuven, BelgiumMax-Planck Institut für Extraterrestrische PhysikDepartment of Astrophysics, IMAPP, Radboud University, Nijmegen, The NetherlandsDepartment of Physics and Astronomy, University of Exeter, Exeter, UKCentro de Astrobiología, CSIC-INTA, Madrid, SpainLeiden Observatory, Leiden University, Leiden, the NetherlandsLeiden Observatory, Leiden University, Leiden, the Netherlands
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Giulia Perotti,Nicolás T. Kurtovic,Thomas Henning,G?ran Olofsson,Aditya M. Arabhavi,Kamber Schwarz,Jayatee Kanwar,Roy van Boekel,Inga Kamp,Ilaria Pascucci,Ewine F. van Dishoeck,Manuel Güdel,Pierre-Olivier Lagage,David Barrado,Alessio Caratti o Garatti,Adrian M. Glauser,F. Lahuis,Valentin Christiaens,Riccardo Franceschi,Danny Gasman,Sierra L. Grant,Hyerin Jang,Till Kaeufer,Maria Morales-Calderón,Milou Temmink,Marissa Vlasblom.MINDS. Anatomy of a water-rich, inclined, brown dwarf disk: lack of abundant hydrocarbons[EB/OL].(2025-04-15)[2025-07-22].https://arxiv.org/abs/2504.11424.点此复制
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