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14 results on '"Petrus, S"'

1. Astrometric and photometric characterization of eta Tel B combining two decades of observations

Author

Nogueira, P.H., primary, Lazzoni, C., additional, Zurlo, A., additional, Bhowmik, T., additional, Donoso-Oliva, C., additional, Desidera, S., additional, Milli, J., additional, Pérez, S., additional, Delorme, P., additional, Fernadez, A., additional, Langlois, M., additional, Petrus, S., additional, Cabrera-Vives, G., additional, and Chauvin, G., additional

Published
2024
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2. Atmospheric properties of AF Lep b with forward modeling

Author

Palma-Bifani, P., primary, Chauvin, G., additional, Borja, D., additional, Bonnefoy, M., additional, Petrus, S., additional, Mesa, D., additional, De Rosa, R. J., additional, Gratton, R., additional, Baudoz, P., additional, Boccaletti, A., additional, Charnay, B., additional, Desgrange, C., additional, Tremblin, P., additional, and Vigan, A., additional

Published
2024
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3. Astrometric and photometric characterization of η Tel B combining two decades of observations.

Author

Nogueira, P. H., Lazzoni, C., Zurlo, A., Bhowmik, T., Donoso-Oliva, C., Desidera, S., Milli, J., Pérez, S., Delorme, P., Fernadez, A., Langlois, M., Petrus, S., Cabrera-Vives, G., and Chauvin, G.

Subjects
BROWN dwarf stars, ORBITS (Astronomy), ADAPTIVE optics, NATURAL satellites, IMAGE processing
Abstract

Context. η Tel is an 18 Myr system composed of a 2.09 M⊙ A-type star with an M7-M8 brown dwarf companion, η Tel B. The two objects have a projected separation of 4″.2 (~208 au). This system has been targeted by high-contrast imaging campaigns for over 20 yr, facilitating its orbital and photometric characterization. The companion, η Tel B, both bright and on a wide orbit, is an ideal candidate for a detailed examination of its position and the characterization of its atmosphere. Aims. To explore the orbital parameters of η Tel B, measure its contrast, and investigate its close surroundings, we analyzed three new SPHERE/IRDIS coronagraphic observations. Our objectives are to investigate the possibility of a circumplanetary disk or a close companion around η Tel B, and characterize its orbit by combining this new data set with archival data acquired in the past two decades. Methods. The IRDIS data are reduced with state-of-the-art algorithms to achieve a contrast with respect to the star of 1.0 × 10−5 at the location of the companion. Using the NEGative Fake Companion technique (NEGFC), we measure the astrometric positions and flux of η Tel B for the three IRDIS epochs. Together with the measurements presented in the literature, the baseline of the astrometric follow-up is 19 yr. Results. We calculate a contrast for the companion of 6.8 magnitudes in the H band. The separation and position angle measured are 4″.218 and 167.3 degrees, respectively. The astrometric positions of the companions are calculated with an uncertainty of 4 milliarc-seconds (mas) in separation and 0.2 degrees in position angle. These are the smallest astrometrical uncertainties of η Tel B obtained so far. The orbital parameters are estimated using the Orvara code, including all available epochs. The orbital analysis is performed taking into account the Gaia-HIPPARCOS acceleration of the system. Suppressing its point spread function (PSF), we have produced contrast curves centered on the brown dwarf in order to constrain our detection capabilities for a disk or companions around it. Conclusions. After considering only orbits that could not disrupt the outer debris disk around η Tel A, our orbital analysis reveals a low eccentric orbit (e ~ 0.34) with an inclination of 81.9 degrees (nearly edge-on) and a semi-major axis of 218 au. Furthermore, we determine the mass of η Tel B to be 48 MJup, consistent with previous calculations from the literature based on evolutionary models. Finally, we do not detect any significant residual pointing to the presence of a satellite or a disk around the brown dwarf. The retrieved detection limits allow us to discard massive objects around η Tel B with masses down to 1.6 MJup at a separation of 33 au. [ABSTRACT FROM AUTHOR]

Published
2024
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4. Emission line variability of young 10–30 MJup companions

Author

Demars, D., primary, Bonnefoy, M., additional, Dougados, C., additional, Aoyama, Y., additional, Thanathibodee, T., additional, Marleau, G.-D., additional, Tremblin, P., additional, Delorme, P., additional, Palma-Bifani, P., additional, Petrus, S., additional, Bowler, B. P., additional, Chauvin, G., additional, and Lagrange, A.-M., additional

Published
2023
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5. X-SHYNE: X-shooter spectra of young exoplanet analogs

Author

Petrus, S., primary, Chauvin, G., additional, Bonnefoy, M., additional, Tremblin, P., additional, Charnay, B., additional, Delorme, P., additional, Marleau, G.-D., additional, Bayo, A., additional, Manjavacas, E., additional, Lagrange, A.-M., additional, Mollière, P., additional, Palma-Bifani, P., additional, Biller, B., additional, Jenkins, J.-S., additional, Goyal, J.-M., additional, and Hoch, K., additional

Published
2023
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6. Peering into the young planetary system AB Pic. Atmosphere, orbit, obliquity, and second planetary candidate

Author

Palma-Bifani, P., primary, Chauvin, G., additional, Bonnefoy, M., additional, Rojo, P. M., additional, Petrus, S., additional, Rodet, L., additional, Langlois, M., additional, Allard, F., additional, Charnay, B., additional, Desgrange, C., additional, Homeier, D., additional, Lagrange, A.-M., additional, Beuzit, J.-L., additional, Baudoz, P., additional, Boccaletti, A., additional, Chomez, A., additional, Delorme, P., additional, Desidera, S., additional, Feldt, M., additional, Ginski, C., additional, Gratton, R., additional, Maire, A.-L., additional, Meyer, M., additional, Samland, M., additional, Snellen, I., additional, Vigan, A., additional, and Zhang, Y., additional

Published
2022
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7. In-depth direct imaging and spectroscopic characterization of the young Solar System analog HD 95086

Author

Desgrange, C., primary, Chauvin, G., additional, Christiaens, V., additional, Cantalloube, F., additional, Lefranc, L.-X., additional, Le Coroller, H., additional, Rubini, P., additional, Otten, G. P. P. L., additional, Beust, H., additional, Bonavita, M., additional, Delorme, P., additional, Devinat, M., additional, Gratton, R., additional, Lagrange, A.-M., additional, Langlois, M., additional, Mesa, D., additional, Milli, J., additional, Szulágyi, J., additional, Nowak, M., additional, Rodet, L., additional, Rojo, P., additional, Petrus, S., additional, Janson, M., additional, Henning, T., additional, Kral, Q., additional, van Holstein, R. G., additional, Ménard, F., additional, Beuzit, J.-L., additional, Biller, B., additional, Boccaletti, A., additional, Bonnefoy, M., additional, Brown, S., additional, Costille, A., additional, Delboulbe, A., additional, Desidera, S., additional, D’Orazi, V., additional, Feldt, M., additional, Fusco, T., additional, Galicher, R., additional, Hagelberg, J., additional, Lazzoni, C., additional, Ligi, R., additional, Maire, A.-L., additional, Messina, S., additional, Meyer, M., additional, Potier, A., additional, Ramos, J., additional, Rouan, D., additional, Schmidt, T., additional, Vigan, A., additional, and Zurlo, A., additional

Published
2022
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8. New binaries from the SHINE survey

Author

Bonavita, M., primary, Gratton, R., additional, Desidera, S., additional, Squicciarini, V., additional, D’Orazi, V., additional, Zurlo, A., additional, Biller, B., additional, Chauvin, G., additional, Fontanive, C., additional, Janson, M., additional, Messina, S., additional, Menard, F., additional, Meyer, M., additional, Vigan, A., additional, Avenhaus, H., additional, Asensio Torres, R., additional, Beuzit, J.-L., additional, Boccaletti, A., additional, Bonnefoy, M., additional, Brandner, W., additional, Cantalloube, F., additional, Cheetham, A., additional, Cudel, M., additional, Daemgen, S., additional, Delorme, P., additional, Desgrange, C., additional, Dominik, C., additional, Engler, N., additional, Feautrier, P., additional, Feldt, M., additional, Galicher, R., additional, Garufi, A., additional, Gasparri, D., additional, Ginski, C., additional, Girard, J., additional, Grandjean, A., additional, Hagelberg, J., additional, Henning, T., additional, Hunziker, S., additional, Kasper, M., additional, Keppler, M., additional, Lagadec, E., additional, Lagrange, A.-M., additional, Langlois, M., additional, Lannier, J., additional, Lazzoni, C., additional, Le Coroller, H., additional, Ligi, R., additional, Lombart, M., additional, Maire, A.-L., additional, Mazevet, S., additional, Mesa, D., additional, Mouillet, D., additional, Moutou, C., additional, Müller, A., additional, Peretti, S., additional, Perrot, C., additional, Petrus, S., additional, Potier, A., additional, Ramos, J., additional, Rickman, E., additional, Rouan, D., additional, Salter, G., additional, Samland, M., additional, Schmidt, T., additional, Sissa, E., additional, Stolker, T., additional, Szulágyi, J., additional, Turatto, M., additional, Udry, S., additional, and Wildi, F., additional

Published
2022
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9. Medium-resolution spectrum of the exoplanet HIP 65426 b

Author

Petrus, S., primary, Bonnefoy, M., additional, Chauvin, G., additional, Charnay, B., additional, Marleau, G.-D., additional, Gratton, R., additional, Lagrange, A.-M., additional, Rameau, J., additional, Mordasini, C., additional, Nowak, M., additional, Delorme, P., additional, Boccaletti, A., additional, Carlotti, A., additional, Houllé, M., additional, Vigan, A., additional, Allard, F., additional, Desidera, S., additional, D’Orazi, V., additional, Hoeijmakers, H. J., additional, Wyttenbach, A., additional, and Lavie, B., additional

Published
2021
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10. Investigating three Sirius-like systems with SPHERE

Author

Gratton, R., primary, D’Orazi, V., additional, Pacheco, T. A., additional, Zurlo, A., additional, Desidera, S., additional, Meléndez, J., additional, Mesa, D., additional, Claudi, R., additional, Janson, M., additional, Langlois, M., additional, Rickman, E., additional, Samland, M., additional, Moulin, T., additional, Soenke, C., additional, Cascone, E., additional, Ramos, J., additional, Rigal, F., additional, Avenhaus, H., additional, Beuzit, J. L., additional, Biller, B., additional, Boccaletti, A., additional, Bonavita, M., additional, Bonnefoy, M., additional, Brandner, W., additional, Chauvin, G., additional, Cudel, M., additional, Daemgen, S., additional, Delorme, P., additional, Desgrange, C., additional, Engler, N., additional, Feldt, M., additional, Fontanive, C., additional, Galicher, R., additional, Garufi, A., additional, Gasparri, D., additional, Ginski, C., additional, Girard, J., additional, Hagelberg, J., additional, Hunziker, S., additional, Kasper, M., additional, Keppler, M., additional, Lagrange, A.-M., additional, Lannier, J., additional, Lazzoni, C., additional, Le Coroller, H., additional, Ligi, R., additional, Lombart, M., additional, Maire, A.-L., additional, Mayer, M. R., additional, Mazevet, S., additional, Ménard, F., additional, Mouillet, D., additional, Perrot, C., additional, Peretti, S., additional, Petrus, S., additional, Potier, A., additional, Rouan, D., additional, Schmid, H. M., additional, Schmidt, T. O. B., additional, Sissa, E., additional, Stolker, T., additional, Salter, G., additional, Vigan, A., additional, and Wildi, F., additional

Published
2021
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11. A new take on the low-mass brown dwarf companions on wide orbits in Upper-Scorpius

Author

Petrus, S., Bonnefoy, M., Chauvin, G., Babusiaux, C., Delorme, P., Lagrange, A. -M., Florent, N., Bayo, A., Janson, M., Biller, B., Manjavacas, E., Marleau, G. -D., Kopytova, T., Petrus, S., Bonnefoy, M., Chauvin, G., Babusiaux, C., Delorme, P., Lagrange, A. -M., Florent, N., Bayo, A., Janson, M., Biller, B., Manjavacas, E., Marleau, G. -D., and Kopytova, T.

Abstract

Context. The Upper-Scorpius association (5 11 Myr) contains a unique population of low-mass (M< 30 MJup) brown dwarfs either free-floating, forming wide pairs, or on wide orbits around solar-type and massive stars. The detailed relative characterization of their physical properties (mass, radius, temperature, composition, and ongoing accretion) offers the opportunity to potentially explore their origin and mechanisms of formation. Aims. In this study, we aim to characterize the chemical and physical properties of three young, late-M brown dwarfs claimed to be companions of the Upper-Scorpius stars USco 161031.9-16191305, HIP 77900, and HIP 78530 using medium-resolution spectroscopy at UV (0:300:56 m; R 3300), optical (0:551:02 m; RA - 5400), and NIR (1:022:48 m; RA - 4300) wavelengths. The spectra of six free-floating analogs from the same association are analyzed for comparison and to explore the potential physical differences between these substellar objects found in different configurations. We also aim to examine and analyze hydrogen emission lines at UV and optical wavelengths to investigate the presence of ongoing accretion processes. Methods. The X-shooter spectrograph at VLT was used to obtain the spectra of the nine young brown dwarfs over the 0:32:5 mrange simultaneously. Performing a forward modeling of the observed spectra with the ForMoSA code, we infer the Teff, log (g), and radius of our objects. The code compares here the BT-SETTL15 models to the observed spectra using the Nested Sampling Bayesian inference method. Mass is determined using evolutionary models, and a new analysis of the physical association is presented based on Gaia-DR2 astrometry. Results. The Teff and log (g) determined for our companions are compatible with those found for free-floating analogs of the Upper-Scorpius association and with evolutionary model predictions at the age of the association. However the final accuracy on the Teff estimates is strongly limited by nonreproduci

Published
2020

12. HD 117214 debris disk: scattered-light images and constraints on the presence of planets

Author

Engler, N., primary, Lazzoni, C., additional, Gratton, R., additional, Milli, J., additional, Schmid, H. M., additional, Chauvin, G., additional, Kral, Q., additional, Pawellek, N., additional, Thébault, P., additional, Boccaletti, A., additional, Bonnefoy, M., additional, Brown, S., additional, Buey, T., additional, Cantalloube, F., additional, Carle, M., additional, Cheetham, A., additional, Desidera, S., additional, Feldt, M., additional, Ginski, C., additional, Gisler, D., additional, Henning, Th., additional, Hunziker, S., additional, Lagrange, A. M., additional, Langlois, M., additional, Mesa, D., additional, Meyer, M. R., additional, Moeller-Nilsson, O., additional, Olofsson, J., additional, Petit, C., additional, Petrus, S., additional, Quanz, S. P., additional, Rickman, E., additional, Stadler, E., additional, Stolker, T., additional, Vigan, A., additional, Wildi, F., additional, and Zurlo, A., additional

Published
2020
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14. VLT/SPHERE exploration of the young multiplanetary system PDS70

Author

Mesa, D., primary, Keppler, M., additional, Cantalloube, F., additional, Rodet, L., additional, Charnay, B., additional, Gratton, R., additional, Langlois, M., additional, Boccaletti, A., additional, Bonnefoy, M., additional, Vigan, A., additional, Flasseur, O., additional, Bae, J., additional, Benisty, M., additional, Chauvin, G., additional, de Boer, J., additional, Desidera, S., additional, Henning, T., additional, Lagrange, A.-M., additional, Meyer, M., additional, Milli, J., additional, Müller, A., additional, Pairet, B., additional, Zurlo, A., additional, Antoniucci, S., additional, Baudino, J.-L., additional, Brown Sevilla, S., additional, Cascone, E., additional, Cheetham, A., additional, Claudi, R. U., additional, Delorme, P., additional, D’Orazi, V., additional, Feldt, M., additional, Hagelberg, J., additional, Janson, M., additional, Kral, Q., additional, Lagadec, E., additional, Lazzoni, C., additional, Ligi, R., additional, Maire, A.-L., additional, Martinez, P., additional, Menard, F., additional, Meunier, N., additional, Perrot, C., additional, Petrus, S., additional, Pinte, C., additional, Rickman, E. L., additional, Rochat, S., additional, Rouan, D., additional, Samland, M., additional, Sauvage, J.-F., additional, Schmidt, T., additional, Udry, S., additional, Weber, L., additional, and Wildi, F., additional

Published
2019
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