3D radiative transfer models: bridging theory and observations

• Grant number: 10/19029-0
• Support Opportunities: Regular Research Grants
• Start date: April 01, 2011
• End date: June 30, 2013
• Field of knowledge: Physical Sciences and Mathematics - Astronomy - Stellar Astrophysics
• Principal Investigator: Alex Cavaliéri Carciofi
• Grantee: Alex Cavaliéri Carciofi
• Host Institution: Instituto de Astronomia, Geofísica e Ciências Atmosféricas (IAG). Universidade de São Paulo (USP). São Paulo , SP, Brazil
• Associated researchers: Xavier Marie Alain Haubois

Abstract

Interferometry at the infrared and optical domains of the spectrum is bringing substantial progress in many areas of astrophysics, in particular stellar astrophysics, because it allows observing with unprecedented details nearby stellar objects in the Galaxy. In addition to this observational revolution, there has also been important progress in the field of computational simulations. The computer code HDUST, whose author is the principal investigator of this project, is a theoretical tool that allows for solving the radiative transfer equation and the thermodynamic equilibrium in the non-local regime (NLTE) for arbitrary, three-dimensional geometries. As such, it allows for realistic numerical simulations of various kinds of astrophysical objects. Those simulations, and their application to analyzing interferometric data of Be and B[e] stars, constitute the core of our research in the past few years. This Research Project proposes financial support for a series of actions (international collaborative visits, acquisition of equipment and software, etc) to the goal of allowing us to maintain and expand our research activities over the next two years. (AU)

Scientific publications

(17)

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

STEFL, S.; LE BOUQUIN, J. -B.; CARCIOFI, A. C.; RIVINIUS, T.; BAADE, D.; RANTAKYROE, F.. New activity in the large circumstellar disk of the Be-shell star 48 Librae. Astronomy & Astrophysics, v. 540, APR 2012. (10/19029-0)

DE SOUZA, A. DOMICIANO; HADJARA, M.; VAKILI, F.; BENDJOYA, P.; MILLOUR, F.; ABE, L.; CARCIOFI, A. C.; FAES, D. M.; KERVELLA, P.; LAGARDE, S.; et al. Beyond the diffraction limit of optical/IR interferometers I. Angular diameter and rotation parameters of Achernar from differential phases. Astronomy & Astrophysics, v. 545, SEP 2012. (10/19029-0)

CARCIOFI, ALEX C.; BJORKMAN, JON E.; OTERO, SEBASTIAN A.; OKAZAKI, ATSUO T.; STEFL, STANISLAV; RIVINIUS, THOMAS; BAADE, DIETRICH; HAUBOIS, XAVIER. THE FIRST DETERMINATION OF THE VISCOSITY PARAMETER IN THE CIRCUMSTELLAR DISK OF A Be STAR. Astrophysical Journal Letters, v. 744, n. 1, JAN 1 2012. (10/19029-0, 10/16037-2, 09/07477-1)

CARCIOFI, A. C.; FAES, D. M.; TOWNSEND, R. H. D.; BJORKMAN, J. E.. POLARIMETRIC OBSERVATIONS OF sigma ORIONIS E. Astrophysical Journal Letters, v. 766, n. 1, MAR 20 2013. (10/19060-5, 09/54006-4, 10/19029-0)

RIVINIUS, TH; BAADE, D.; TOWNSEND, R. H. D.; CARCIOFI, A. C.; STEFL, S.. Variable rotational line broadening in the Be star Achernar. Astronomy & Astrophysics, v. 559, NOV 2013. (10/19029-0)

FAES, D. M.; CARCIOFI, A. C.; RIVINIUS, TH.; STEFL, S.; BAADE, D.; DE SOUZA, A. DOMICIANO. Differential interferometric phases at high spectral resolution as a sensitive physical diagnostic of circumstellar disks. Astronomy & Astrophysics, v. 555, JUL 2013. (09/54006-4, 10/19029-0, 12/04916-7)

DE SOUZA, A. DOMICIANO; HADJARA, M.; VAKILI, F.; BENDJOYA, P.; MILLOUR, F.; ABE, L.; CARCIOFI, A. C.; FAES, D. M.; KERVELLA, P.; LAGARDE, S.; et al. Beyond the diffraction limit of optical/IR interferometers I. Angular diameter and rotation parameters of Achernar from differential phases. ASTRONOMY & ASTROPHYSICS, v. 545, p. 10-pg., 2012-09-01. (10/19029-0)

CARCIOFI, A. C.; FAES, D. M.; TOWNSEND, R. H. D.; CARCIOFI, AC; RIVINIUS, T. Polarimetric Observations of sigma Orionis E. CIRCUMSTELLAR DYNAMICS AT HIGH RESOLUTION, v. 464, p. 3-pg., 2012-01-01. (10/19029-0, 10/19060-5, 09/54006-4)

STEFL, S.; LEBOUQUIN, J. -B.; RIVINIUS, TH.; BAADE, D.; CARCIOFI, A. C.; HAUBOIS, X.; CORDER, S.; CURE, M.; KANAAN, S.; CARCIOFI, AC; et al. delta Sco 2011 Periastron Passage: Near-IR Interferometry and Radio mm Observations. CIRCUMSTELLAR DYNAMICS AT HIGH RESOLUTION, v. 464, p. 2-pg., 2012-01-01. (10/19029-0)

STEFL, S.; LE BOUQUIN, J. -B.; CARCIOFI, A. C.; RIVINIUS, T.; BAADE, D.; RANTAKYROE, F.. New activity in the large circumstellar disk of the Be-shell star 48 Librae. ASTRONOMY & ASTROPHYSICS, v. 540, p. 12-pg., 2012-04-01. (10/19029-0)

HAUBOIS, X.; MOTA, B. C.; CARCIOFI, A. C.; DRAPER, Z. H.; WISNIEWSKI, J. P.; BEDNARSKI, D.; RIVINIUS, TH. DYNAMICAL EVOLUTION OF VISCOUS DISKS AROUND BE STARS. II. POLARIMETRY. ASTROPHYSICAL JOURNAL, v. 785, n. 1, APR 10 2014. (09/54006-4, 10/19029-0, 09/07477-1)

TAN, LUN C.; REAMES, DONALD V.; NG, CHEE K.; SHAO, XI; WANG, LINGHUA. CORRELATION OF ELECTRON PATH LENGTHS OBSERVED IN THE HIGHLY WOUND OUTER REGION OF MAGNETIC CLOUDS WITH THE SLAB FRACTION OF MAGNETIC TURBULENCE IN THE DISSIPATION RANGE. ASTROPHYSICAL JOURNAL, v. 786, n. 2, MAY 10 2014. (10/19029-0, 09/07477-1)

RIVINIUS, THOMAS; CARCIOFI, ALEX C.; MARTAYAN, CHRISTOPHE. Classical Be stars Rapidly rotating B stars with viscous Keplerian decretion disks. ASTRONOMY AND ASTROPHYSICS REVIEW, v. 21, p. 1-86, OCT 31 2013. (09/54006-4, 10/19029-0)

MIROSHNICHENKO, A. S.; PASECHNIK, A. V.; MANSET, N.; CARCIOFI, A. C.; RIVINIUS, TH.; STEFL, S.; GVARAMADZE, V. V.; RIBEIRO, J.; FERNANDO, A.; GARREL, T.; et al. THE 2011 PERIASTRON PASSAGE OF THE Be BINARY delta Scorpii. ASTROPHYSICAL JOURNAL, v. 766, n. 2, APR 1 2013. (10/19029-0)

SALES, DINALVA A.; PASTORIZA, M. G.; RIFFEL, R.; WINGE, C.; RODRIGUEZ-ARDILA, A.; CARCIOFI, A. C.. THE COMPTON-THICK SEYFERT 2 NUCLEUS OF NGC 3281: TORUS CONSTRAINTS FROM THE 9.7 mu m SILICATE ABSORPTION. ASTROPHYSICAL JOURNAL, v. 738, n. 1, SEP 1 2011. (10/19029-0)

HAUBOIS, X.; CARCIOFI, A. C.; RIVINIUS, TH; OKAZAKI, A. T.; BJORKMAN, J. E.. DYNAMICAL EVOLUTION OF VISCOUS DISKS AROUND Be STARS. I. PHOTOMETRY. ASTROPHYSICAL JOURNAL, v. 756, n. 2, SEP 10 2012. (09/54006-4, 10/19029-0, 10/16037-2, 09/07477-1)

WHEELWRIGHT, H. E.; BJORKMAN, J. E.; OUDMAIJER, R. D.; CARCIOFI, A. C.; CARCIOFI, AC; RIVINIUS, T. Spectroastrometry and NLTE Modeling of the Disk Around the Be Star beta CMi. CIRCUMSTELLAR DYNAMICS AT HIGH RESOLUTION, v. 464, p. 3-pg., 2012-01-01. (10/19029-0)