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Sub-milliarcsecond Optical Interferometry of the HMXB BP Cru with VLTI/GRAVITY

Fuente: arXiv

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Detalles Bibliográficos
Autores principales:	GRAVITY Collaboration, Waisberg, I., Dexter, J., Pfuhl, O., Abuter, R., Amorin, A., Anugu, N., Berger, J. P., Blind, N., Bonnet, H., Brandner, W., Buron, A., Clénet, Y., de Wit, W., Deen, C., Delplancke-Ströbele, F., Dembet, R., Duvert, G., Eckart, A., Eisenhauer, F., Fédou, P., Finger, G., Garcia, P., Lopez, R. Garcia, Gendron, E., Genzel, R., Gillessen, S., Haubois, X., Haug, M., Haussmann, F., Henning, Th., Hippler, S., Horrobin, M., Hubert, Z., Jochum, L., Jocou, L., Kervella, P., Kok, Y., Kulas, M., Lacour, S., Lapeyrère, V., Bouquin, J. -B. Le, Lèna, P., Lippa, M., Mérand, A., Müller, E., Ott, T., Pallanca, L., Panduro, J., Paumard, T., Perraut, K., Perrin, G., Rabien, S., Ramírez, A., Ramos, J., Rau, C., Rohloff, R. -R., Rousset, G., Sanchez-Bermudez, J., Scheithauer, S., Schöller, M., Straubmeier, C., Sturm, E., Vincent, F., Wank, I., Wieprecht, E., Wiest, M., Wiezorrek, E., Wittkowski, M., Woillez, J., Yazici, S.
Formato:	Preprint
Publicado:	2017
Materias:	Solar and Stellar Astrophysics High Energy Astrophysical Phenomena
Acceso en línea:	Acceder al recurso
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

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author	GRAVITY Collaboration Waisberg, I. Dexter, J. Pfuhl, O. Abuter, R. Amorin, A. Anugu, N. Berger, J. P. Blind, N. Bonnet, H. Brandner, W. Buron, A. Clénet, Y. de Wit, W. Deen, C. Delplancke-Ströbele, F. Dembet, R. Duvert, G. Eckart, A. Eisenhauer, F. Fédou, P. Finger, G. Garcia, P. Lopez, R. Garcia Gendron, E. Genzel, R. Gillessen, S. Haubois, X. Haug, M. Haussmann, F. Henning, Th. Hippler, S. Horrobin, M. Hubert, Z. Jochum, L. Jocou, L. Kervella, P. Kok, Y. Kulas, M. Lacour, S. Lapeyrère, V. Bouquin, J. -B. Le Lèna, P. Lippa, M. Mérand, A. Müller, E. Ott, T. Pallanca, L. Panduro, J. Paumard, T. Perraut, K. Perrin, G. Rabien, S. Ramírez, A. Ramos, J. Rau, C. Rohloff, R. -R. Rousset, G. Sanchez-Bermudez, J. Scheithauer, S. Schöller, M. Straubmeier, C. Sturm, E. Vincent, F. Wank, I. Wieprecht, E. Wiest, M. Wiezorrek, E. Wittkowski, M. Woillez, J. Yazici, S.
author_facet	GRAVITY Collaboration Waisberg, I. Dexter, J. Pfuhl, O. Abuter, R. Amorin, A. Anugu, N. Berger, J. P. Blind, N. Bonnet, H. Brandner, W. Buron, A. Clénet, Y. de Wit, W. Deen, C. Delplancke-Ströbele, F. Dembet, R. Duvert, G. Eckart, A. Eisenhauer, F. Fédou, P. Finger, G. Garcia, P. Lopez, R. Garcia Gendron, E. Genzel, R. Gillessen, S. Haubois, X. Haug, M. Haussmann, F. Henning, Th. Hippler, S. Horrobin, M. Hubert, Z. Jochum, L. Jocou, L. Kervella, P. Kok, Y. Kulas, M. Lacour, S. Lapeyrère, V. Bouquin, J. -B. Le Lèna, P. Lippa, M. Mérand, A. Müller, E. Ott, T. Pallanca, L. Panduro, J. Paumard, T. Perraut, K. Perrin, G. Rabien, S. Ramírez, A. Ramos, J. Rau, C. Rohloff, R. -R. Rousset, G. Sanchez-Bermudez, J. Scheithauer, S. Schöller, M. Straubmeier, C. Sturm, E. Vincent, F. Wank, I. Wieprecht, E. Wiest, M. Wiezorrek, E. Wittkowski, M. Woillez, J. Yazici, S.
contents	We observe the HMXB BP Cru using interferometry in the near-infrared K band with VLTI/GRAVITY. Continuum visibilities are at most partially resolved, consistent with the predicted size of the hypergiant. Differential visibility amplitude ($Δ\|V\| \sim 5\%$) and phase ($Δϕ\sim 2 °$) signatures are observed across the HeI $2.059 μ$m and Br$γ$ lines, the latter seen strongly in emission, unusual for the donor star's spectral type. For a baseline $B \sim 100$m, the differential phase RMS $\sim 0.2 °$ corresponds to an astrometric precision of $\sim 2 μ$as. A model-independent analysis in the marginally resolved limit of interferometry reveals asymmetric and extended emission with a strong wavelength dependence. We propose geometric models based on an extended and distorted wind and/or a high density gas stream, which has long been predicted to be present in this system. The observations show that optical interferometry is now able to resolve HMXBs at the spatial scale at which accretion takes place, and therefore probe the effects of the gravitational and radiation fields of the compact object on its environment.
format	Preprint
id	arxiv_https___arxiv_org_abs_1705_02351
institution	arXiv
publishDate	2017
record_format	arxiv
spellingShingle	Sub-milliarcsecond Optical Interferometry of the HMXB BP Cru with VLTI/GRAVITY GRAVITY Collaboration Waisberg, I. Dexter, J. Pfuhl, O. Abuter, R. Amorin, A. Anugu, N. Berger, J. P. Blind, N. Bonnet, H. Brandner, W. Buron, A. Clénet, Y. de Wit, W. Deen, C. Delplancke-Ströbele, F. Dembet, R. Duvert, G. Eckart, A. Eisenhauer, F. Fédou, P. Finger, G. Garcia, P. Lopez, R. Garcia Gendron, E. Genzel, R. Gillessen, S. Haubois, X. Haug, M. Haussmann, F. Henning, Th. Hippler, S. Horrobin, M. Hubert, Z. Jochum, L. Jocou, L. Kervella, P. Kok, Y. Kulas, M. Lacour, S. Lapeyrère, V. Bouquin, J. -B. Le Lèna, P. Lippa, M. Mérand, A. Müller, E. Ott, T. Pallanca, L. Panduro, J. Paumard, T. Perraut, K. Perrin, G. Rabien, S. Ramírez, A. Ramos, J. Rau, C. Rohloff, R. -R. Rousset, G. Sanchez-Bermudez, J. Scheithauer, S. Schöller, M. Straubmeier, C. Sturm, E. Vincent, F. Wank, I. Wieprecht, E. Wiest, M. Wiezorrek, E. Wittkowski, M. Woillez, J. Yazici, S. Solar and Stellar Astrophysics High Energy Astrophysical Phenomena We observe the HMXB BP Cru using interferometry in the near-infrared K band with VLTI/GRAVITY. Continuum visibilities are at most partially resolved, consistent with the predicted size of the hypergiant. Differential visibility amplitude ($Δ\|V\| \sim 5\%$) and phase ($Δϕ\sim 2 °$) signatures are observed across the HeI $2.059 μ$m and Br$γ$ lines, the latter seen strongly in emission, unusual for the donor star's spectral type. For a baseline $B \sim 100$m, the differential phase RMS $\sim 0.2 °$ corresponds to an astrometric precision of $\sim 2 μ$as. A model-independent analysis in the marginally resolved limit of interferometry reveals asymmetric and extended emission with a strong wavelength dependence. We propose geometric models based on an extended and distorted wind and/or a high density gas stream, which has long been predicted to be present in this system. The observations show that optical interferometry is now able to resolve HMXBs at the spatial scale at which accretion takes place, and therefore probe the effects of the gravitational and radiation fields of the compact object on its environment.
title	Sub-milliarcsecond Optical Interferometry of the HMXB BP Cru with VLTI/GRAVITY
topic	Solar and Stellar Astrophysics High Energy Astrophysical Phenomena
url	https://arxiv.org/abs/1705.02351