techniques:imageprocessing; planets and satellites: formation; planet-disc interactions; protoplanetary discs
Abstract :
[en] Understanding how giant planets form requires observational input from directly imaged protoplanets. We used VLT/NACO and VLT/SPHERE to search for companions in the transition disc of 2MASS J19005804-3645048 (hereafter CrA-9), an accreting M0.75 dwarf with an estimated age of 1-2 Myr. We found a faint point source at ∼0.7-arcsec separation from CrA-9 (∼108 au projected separation). Our 3-epoch astrometry rejects a fixed background star with a 5σ significance. The near-IR absolute magnitudes of the object point towards a planetary-mass companion. However, our analysis of the 1.0-3.8 µm spectrum extracted for the companion suggests it is a young M5.5 dwarf, based on both the 1.13-μm Na index and comparison with templates of the Montreal Spectral Library. The observed spectrum is best reproduced with high effective temperature ( $3057^{+119}_{-36}$ K) BT-DUSTY and BT-SETTL models, but the corresponding photometric radius required to match the measured flux is only $0.60^{+0.01}_{-0.04}$ Jovian radius. We discuss possible explanations to reconcile our measurements, including an M-dwarf companion obscured by an edge-on circum-secondary disc or the shock-heated part of the photosphere of an accreting protoplanet. Follow-up observations covering a larger wavelength range and/or at finer spectral resolution are required to discriminate these two scenarios.
Research center :
STAR - Space sciences, Technologies and Astrophysics Research - ULiège
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Christiaens, V.
Ubeira-Gabellini, M.-G.
Cánovas, H.
Delorme, P.
Pairet, B.
Absil, Olivier ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > PSILab
Allard F., 2014, in Booth M., Matthews B. C., Graham J. R., eds, Proc. IAU Symp. 299, Exploring the Formation and Evolution of Planetary Systems. Cambridge University Press, Victoria, Canada, p. 271
Allard F., Homeier D., Freytag B., 2011, in Johns-Krull C., Browning M. K., West A. A., eds, ASP Conf. Ser., Vol. 448, 16th CambridgeWorkshop on Cool Stars, Stellar Systems, and the Sun. Astron. Soc. Pac., San Fransisco, p. 91
Allard F., Homeier D., Freytag B., 2012, Phil. Trans. R. Soc. A, 370, 2765
Baraffe I., Chabrier G., Barman T. S., Allard F., Hauschildt P. H., 2003, A&A, 402, 701
Baraffe I., Homeier D., Allard F., Chabrier G., 2015, A&A, 577, A42
Bate M. R., 2018, MNRAS, 475, 5618
Beckwith S. V. W., Sargent A. I., Chini R. S., Guesten R., 1990, AJ, 99, 924
Beuzit J.-L. et al., 2008, in McLean I. S., Casali M. M., eds, Proc. SPIE Conf. Ser., Vol. 7014, Ground-based and Airborne Instrumentation for Astronomy II. SPIE, Bellingham
Bonnefoy M. et al., 2013, A&A, 555, A107
Bonnefoy M., Chauvin G., Lagrange A.-M., Rojo P., Allard F., Pinte C., Dumas C., Homeier D., 2014, A&A, 562, A127
Boss A. P., 1998, ApJ, 503, 923
Bouvier J., Dougados C., Alencar S. H. P., 2004, Ap&SS, 292, 659
Bowler B. P., 2016, PASP, 128, 102001
Brandt T. D., Dupuy T. J., Bowler B. P., 2019, AJ, 158, 140
Brandt T. D., Dupuy T. J., Bowler B. P., Bardalez Gagliuffi D. C., Faherty J., Brandt G. M., Michalik D., 2020, AJ, 160, 196
Bresnahan D. et al., 2018, A&A, 615, A125
Burnham K. P., Anderson D. R., eds., 2002, Information and Likelihood Theory: A Basis for Model Selection and Inference. Springer, New York, NY, p. 49
Calcino J., Christiaens V., Price D. J., Pinte C., Davis T. M., van der Marel N., Cuello N., 2020, MNRAS, 498, 639
Calvet N., Muzerolle J., Briceño C., Hernández J., Hartmann L., Saucedo J. L., Gordon K. D., 2004, AJ, 128, 1294
Canovas H., Rodenhuis M., Jeffers S. V., Min M., Keller C. U., 2011, A&A, 531, A102
Canovas H. et al., 2015, ApJ, 805, 21
Cardelli J. A., Clayton G. C., Mathis J. S., 1989, ApJ, 345, 245
Claudi R. U. et al., 2008, in McLean I. S., Casali M. M., eds, Proc. SPIE Conf. Ser., Vol. 7014, Ground-based and Airborne Instrumentation for Astronomy II. SPIE, Bellingham, p. 70143E
Cruz K. L., Reid I. N., 2002, AJ, 123, 2828
Cuello N. et al., 2020, MNRAS, 491, 504
Currie T. et al., 2019, ApJ, 877, L3
Cutri R. M. et al., 2003, VizieR Online Data Catalog, II/246
Delorme P. et al., 2017a, in Reylé C., Di Matteo P., Herpin F., Lagadec E., Lancon A., Meliani Z., Royer F., eds, SF2A-2017: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics. SF2A, Paris, France, p. 347
Delorme P. et al., 2017b, A&A, 608, A79
Dohlen K. et al., 2008, in McLean I. S., Casali M. M., eds, Proc. SPIE Conf. Ser., Vol. 7014, Ground-based and Airborne Instrumentation for Astronomy II. SPIE, Bellingham, p. 70143L
Dong R. et al., 2012, ApJ, 760, 111
Dong R., Zhu Z., Rafikov R. R., Stone J. M., 2015, ApJ, 809, L5
Dunham M. M. et al., 2015, ApJS, 220, 11
Dzib S. A., Loinard L., Ortiz-León G. N., Rodríguez L. F., Galli P. A. B., 2018, ApJ, 867, 151
Edwards S., Kwan J., Fischer W., Hillenbrand L., Finn K., Fedorenko K., Feng W., 2013, ApJ, 778, 148
Eriksson S. C., Asensio Torres R., Janson M., Aoyama Y., Marleau G.-D., Bonnefoy M., Petrus S., 2020, A&A, 638, L6
Espaillat C. et al., 2014, in Beuther H., Klessen R. S., Dullemond C. P., Henning T., eds, Protostars and Planets VI. Univ. Arizona Press, Tucson, AZ, p. 497
Foreman-Mackey D., Hogg D. W., Lang D., Goodman J., 2013, PASP, 125, 306
Gagné J., Lafrenière D., Doyon R., Malo L., Artigau É., 2014, ApJ, 783, 121
Gagné J. et al., 2015, ApJS, 219, 33
Gaia Collaboration, 2016, A&A, 595, A1
Gaia Collaboration, 2018, A&A, 616, A1
Galicher R. et al., 2018, A&A, 615, A92
Gelman A., Rubin D. B., 1992, Stat. Sci., 7, 457
Ginski C. et al., 2018, A&A, 616, A79
Girardi L. et al., 2012, Astrophysics and Space Science Proceedings, Vol. 26, Red Giants as Probes of the Structure and Evolution of the Milky Way. Springer-Verlag, Berlin Heidelberg, p. 165
Hashimoto J., Aoyama Y., Konishi M., Uyama T., Takasao S., Ikoma M., Tanigawa T., 2020, AJ, 159, 222
Hauschildt P. H., 1992, J. Quant. Spec. Radiat. Transf., 47, 433
Helling C., Woitke P., 2006, A&A, 455, 325
Helling C., Dehn M., Woitke P., Hauschildt P. H., 2008, ApJ, 675, L105
Herczeg G. J., Hillenbrand L. A., 2014, ApJ, 786, 97
Isella A., Benisty M., Teague R., Bae J., Keppler M., Facchini S., Pérez L., 2019, ApJ, 879, L25
Johns-Krull C. M., 2007, ApJ, 664, 975
Johns-Krull C. M., Valenti J. A., Koresko C., 1999, ApJ, 516, 900
Keppler M. et al., 2018, A&A, 617, A44
Keppler M. et al., 2020, A&A, 639, A62
Kratter K., Lodato G., 2016, ARA&A, 54, 271
Kraus A. L., Ireland M. J., Cieza L. A., Hinkley S., Dupuy T. J., Bowler B. P., Liu M. C., 2014, ApJ, 781, 20
Lagrange A.-M. et al., 2009, A&A, 493, L21
Lagrange A.-M. et al., 2010, Science, 329, 57
Launhardt R. et al., 2020, A&A, 635, A162
Lenzen R. et al., 2003, in Iye M., Moorwood A. F. M., eds, Proc. SPIE Conf. Ser., Vol. 4841, Instrument Design and Performance for Optical/Infrared Ground-based Telescopes. SPIE, Bellingham, p. 944
Looper D. L., Bochanski J. J., Burgasser A. J., Mohanty S., Mamajek E. E., Faherty J. K., West A. A., Pitts M. A., 2010, AJ, 140, 1486
Lovelace R. V. E., Covey K. R., Lloyd J. P., 2011, AJ, 141, 51
Luhman K. L. et al., 2008, ApJ, 675, 1375
Maire A.-L. et al., 2016, in Evans Christopher J., Simard L., Takami H., eds, Proc. SPIE Conf. Ser., Vol. 9908, Ground-based and Airborne Instrumentation for Astronomy VI. SPIE, Bellingham, p. 990834
Nutter D. J., Ward-Thompson D., André P., 2005, MNRAS, 357, 975
Olofsson J. et al., 2013, A&A, 552, A4
Owen J. E., 2016, Publ. Astron. Soc. Aust., 33, e005
Paardekooper S.-J., Johansen A., 2018, Space Sci. Rev., 214, 38
Pairet B., Cantalloube F., Gomez Gonzalez C. A., Absil O., Jacques L., 2019, MNRAS, 487, 2262
Pairet B., Cantalloube F., Jacques L., 2020, preprint (arXiv:2008.05170)
Peterson D. E. et al., 2011, ApJS, 194, 43
Pollack J. B., Hubickyj O., Bodenheimer P., Lissauer J. J., Podolak M., Greenzweig Y., 1996, Icarus, 124, 62
Price D. J. et al., 2018, MNRAS, 477, 1270
Quanz S. P., Amara A., Meyer M. R., Kenworthy M. A., Kasper M., Girard J. H., 2013, ApJ, 766, L1
Rich E. A. et al., 2019, ApJ, 875, 38
Romero G. A., Schreiber M. R., Cieza L. A., Rebassa-Mansergas A., Merín B., Smith Castelli A. V., Allen L. E., Morrell N., 2012, ApJ, 749, 79
Rousset G. et al., 2003, in Wizinowich P. L., Bonaccini D., eds, Proc. SPIE Conf. Ser., Vol. 4839, Adaptive Optical System Technologies II. SPIE, Bellingham, p. 140
Sallum S. et al., 2015, Nature, 527, 342
Schmid H. M., Joos F., Tschan D., 2006, A&A, 452, 657
Sicilia-Aguilar A., Henning T., Juhász A., Bouwman J., Garmire G., Garmire A., 2008, ApJ, 687, 1145
