The Gemini NICI Planet-Finding Campaign : Discovery of a Substellar L Dwarf Companion to the Nearby Young M Dwarf CD-35 2722
We present the discovery of a wide (67 AU) substellar companion to the nearby (21 pc) young solar-metallicity M1 dwarf CD-35 2722, a member of the ~100 Myr AB Doradus association. Two epochs of astrometry from the NICI Planet-Finding Campaign confirm that CD-35 2722 B is physically associated with t...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Journal article |
| Language: | English |
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Institute of Physics Publishing
2011
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| _version_ | 1797078140577644544 |
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| author | Wahhaj, Z Liu, M Biller, B Clarke, F Nielsen, E Close, L Hayward, T Mamajek, E Cushing, M Dupuy, T Tecza, M Thatte, N Chun, M Ftaclas, C Hartung, M Reid, I Shkolnik, E Alencar, S Artymowicz, P Boss, A Pino, E Gregorio-Hetem, J Ida, S Kuchner, M Lin, D |
| author_facet | Wahhaj, Z Liu, M Biller, B Clarke, F Nielsen, E Close, L Hayward, T Mamajek, E Cushing, M Dupuy, T Tecza, M Thatte, N Chun, M Ftaclas, C Hartung, M Reid, I Shkolnik, E Alencar, S Artymowicz, P Boss, A Pino, E Gregorio-Hetem, J Ida, S Kuchner, M Lin, D |
| author_sort | Wahhaj, Z |
| collection | OXFORD |
| description | We present the discovery of a wide (67 AU) substellar companion to the nearby (21 pc) young solar-metallicity M1 dwarf CD-35 2722, a member of the ~100 Myr AB Doradus association. Two epochs of astrometry from the NICI Planet-Finding Campaign confirm that CD-35 2722 B is physically associated with the primary star. Near-IR spectra indicate a spectral type of L4\pm1 with a moderately low surface gravity, making it one of the coolest young companions found to date. The absorption lines and near-IR continuum shape of CD-35 2722 B agree especially well the dusty field L4.5 dwarf 2MASS J22244381-0158521, while the near-IR colors and absolute magnitudes match those of the 5 Myr old L4 planetary-mass companion, 1RXS J160929.1-210524 b. Overall, CD-35 2722 B appears to be an intermediate-age benchmark for L-dwarfs, with a less peaked H-band continuum than the youngest objects and near-IR absorption lines comparable to field objects. We fit Ames-Dusty model atmospheres to the near-IR spectra and find T=1700-1900 K and log(g) =4.5\pm0.5. The spectra also show that the radial velocities of components A and B agree to within \pm10 km/s, further confirming their physical association. Using the age and bolometric luminosity of CD-35 2722 B, we derive a mass of 31\pm8 Mjup from the Lyon/Dusty evolutionary models. Altogether, young late-M to mid-L type companions appear to be over-luminous for their near-IR spectral type compared to field objects, in contrast to the under-luminosity of young late-L and early-T dwarfs. |
| first_indexed | 2024-03-07T00:28:14Z |
| format | Journal article |
| id | oxford-uuid:7edda8a3-c4c9-47af-9ac1-0f971e7f022f |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T00:28:14Z |
| publishDate | 2011 |
| publisher | Institute of Physics Publishing |
| record_format | dspace |
| spelling | oxford-uuid:7edda8a3-c4c9-47af-9ac1-0f971e7f022f2022-03-26T21:13:06ZThe Gemini NICI Planet-Finding Campaign : Discovery of a Substellar L Dwarf Companion to the Nearby Young M Dwarf CD-35 2722Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:7edda8a3-c4c9-47af-9ac1-0f971e7f022fEnglishSymplectic Elements at OxfordInstitute of Physics Publishing2011Wahhaj, ZLiu, MBiller, BClarke, FNielsen, EClose, LHayward, TMamajek, ECushing, MDupuy, TTecza, MThatte, NChun, MFtaclas, CHartung, MReid, IShkolnik, EAlencar, SArtymowicz, PBoss, APino, EGregorio-Hetem, JIda, SKuchner, MLin, DWe present the discovery of a wide (67 AU) substellar companion to the nearby (21 pc) young solar-metallicity M1 dwarf CD-35 2722, a member of the ~100 Myr AB Doradus association. Two epochs of astrometry from the NICI Planet-Finding Campaign confirm that CD-35 2722 B is physically associated with the primary star. Near-IR spectra indicate a spectral type of L4\pm1 with a moderately low surface gravity, making it one of the coolest young companions found to date. The absorption lines and near-IR continuum shape of CD-35 2722 B agree especially well the dusty field L4.5 dwarf 2MASS J22244381-0158521, while the near-IR colors and absolute magnitudes match those of the 5 Myr old L4 planetary-mass companion, 1RXS J160929.1-210524 b. Overall, CD-35 2722 B appears to be an intermediate-age benchmark for L-dwarfs, with a less peaked H-band continuum than the youngest objects and near-IR absorption lines comparable to field objects. We fit Ames-Dusty model atmospheres to the near-IR spectra and find T=1700-1900 K and log(g) =4.5\pm0.5. The spectra also show that the radial velocities of components A and B agree to within \pm10 km/s, further confirming their physical association. Using the age and bolometric luminosity of CD-35 2722 B, we derive a mass of 31\pm8 Mjup from the Lyon/Dusty evolutionary models. Altogether, young late-M to mid-L type companions appear to be over-luminous for their near-IR spectral type compared to field objects, in contrast to the under-luminosity of young late-L and early-T dwarfs. |
| spellingShingle | Wahhaj, Z Liu, M Biller, B Clarke, F Nielsen, E Close, L Hayward, T Mamajek, E Cushing, M Dupuy, T Tecza, M Thatte, N Chun, M Ftaclas, C Hartung, M Reid, I Shkolnik, E Alencar, S Artymowicz, P Boss, A Pino, E Gregorio-Hetem, J Ida, S Kuchner, M Lin, D The Gemini NICI Planet-Finding Campaign : Discovery of a Substellar L Dwarf Companion to the Nearby Young M Dwarf CD-35 2722 |
| title | The Gemini NICI Planet-Finding Campaign : Discovery of a Substellar L
Dwarf Companion to the Nearby Young M Dwarf CD-35 2722 |
| title_full | The Gemini NICI Planet-Finding Campaign : Discovery of a Substellar L
Dwarf Companion to the Nearby Young M Dwarf CD-35 2722 |
| title_fullStr | The Gemini NICI Planet-Finding Campaign : Discovery of a Substellar L
Dwarf Companion to the Nearby Young M Dwarf CD-35 2722 |
| title_full_unstemmed | The Gemini NICI Planet-Finding Campaign : Discovery of a Substellar L
Dwarf Companion to the Nearby Young M Dwarf CD-35 2722 |
| title_short | The Gemini NICI Planet-Finding Campaign : Discovery of a Substellar L
Dwarf Companion to the Nearby Young M Dwarf CD-35 2722 |
| title_sort | gemini nici planet finding campaign discovery of a substellar l dwarf companion to the nearby young m dwarf cd 35 2722 |
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