Search

Your search keyword '"Coutures, Christian"' showing total 6 results
Start Over Author "Coutures, Christian"
6 results on '"Coutures, Christian"'

1. An Isolated Stellar-Mass Black Hole Detected Through Astrometric Microlensing

Author

Sahu, Kailash C., Anderson, Jay, Casertano, Stefano, Bond, Howard E., Udalski, Andrzej, Dominik, Martin, Calamida, Annalisa, Bellini, Andrea, Brown, Thomas M., Rejkuba, Marina, Bajaj, Varun, Kains, Noe, Ferguson, Henry C., Fryer, Chris L., Yock, Philip, Mroz, Przemek, Kozlowski, Szymon, Pietrukowicz, Pawel, Poleski, Radek, Skowron, Jan, Soszynski, Igor, Szymanski, Michael K., Ulaczyk, Krzysztof, Wyrzykowski, Lukasz, Barry, Richard, Bennett, David P., Bond, Ian A., Hirao, Yuki, Silva, Stela Ishitani, Kondo, Iona, Koshimoto, Naoki, Ranc, Clement, Rattenbury, Nicholas J., Sumi, Takahiro, Suzuki, Daisuke, Tristram, Paul J., Vandorou, Aikaterini, Beaulieu, Jean-Philippe, Marquette, Jean-Baptiste, Cole, Andrew, Fouque, Pascal, Hill, Kym, Dieters, Stefan, Coutures, Christian, Dominis-Prester, Dijana, Bennett, Clara, Bachelet, Etienne, Menzies, John, Alb-row, Michael, Pollard, Karen, Gould, Andrew, Yee, Jennifer, Allen, William, de Almeida, Leonardo Andrade, Christie, Grant, Drummond, John, Gal-Yam, Avishay, Gorbikov, Evgeny, Jablonski, Francisco, Lee, Chung-Uk, Maoz, Dan, Manulis, Ilan, McCormick, Jennie, Natusch, Tim, Pogge, Richard W., Shvartzvald, Yossi, Jorgensen, Uffe G., Alsubai, Khalid A., Andersen, Michael I., Bozza, Valerio, Novati, Sebastiano Calchi, Burgdorf, Martin, Hinse, Tobias C., Hundertmark, Markus, Husser, Tim-Oliver, Kerins, Eamonn, Longa-Pena, Penelope, Mancini, Luigi, Penny, Matthew, Rahvar, Sohrab, Ricci, Davide, Sajadian, Sedighe, Skottfelt, Jesper, Snodgrass, Colin, Southworth, John, Tregloan-Reed, Jeremy, Wambsganss, Joachim, Wertz, Olivier, Tsapras, Yiannis, Street, Rachel A., Bramich, Daniel M., Horne, Keith, and Steele, Iain A.

Subjects
Astrophysics - Solar and Stellar Astrophysics, Astrophysics - Astrophysics of Galaxies, Astrophysics - High Energy Astrophysical Phenomena
Abstract

We report the first unambiguous detection and mass measurement of an isolated stellar-mass black hole (BH). We used the Hubble Space Telescope (HST) to carry out precise astrometry of the source star of the long-duration (t_E~270 days), high-magnification microlensing event MOA-2011-BLG-191/OGLE-2011-BLG-0462 (hereafter designated as MOA-11-191/OGLE-11-462), in the direction of the Galactic bulge. HST imaging, conducted at eight epochs over an interval of six years, reveals a clear relativistic astrometric deflection of the background star's apparent position. Ground-based photometry of MOA-11-191/OGLE-11-462 shows a parallactic signature of the effect of the Earth's motion on the microlensing light curve. Combining the HST astrometry with the ground-based light curve and the derived parallax, we obtain a lens mass of 7.1 +/- 1.3 Msun and a distance of 1.58 +/- 0.18 kpc. We show that the lens emits no detectable light, which, along with having a mass higher than is possible for a white dwarf or neutron star, confirms its BH nature. Our analysis also provides an absolute proper motion for the BH. The proper motion is offset from the mean motion of Galactic-disk stars at similar distances by an amount corresponding to a transverse space velocity of ~45 km/s, suggesting that the BH received a 'natal kick' from its supernova explosion. Previous mass determinations for stellar-mass BHs have come from radial-velocity measurements of Galactic X-ray binaries, and from gravitational radiation emitted by merging BHs in binary systems in external galaxies. Our mass measurement is the first for an isolated stellar-mass BH using any technique., Comment: 37 pages, Published in ApJ

Published
2022
Full Text
View/download PDF

2. The WFIRST Exoplanet Microlensing Survey

Author

Bennett, David P., Akeson, Rachel, Anderson, Jay, Armus, Lee, Bachelet, Etienne, Bailey, Vanessa, Barclay, Thomas, Barry, Richard, Beaulieu, Jean-Phillipe, Belini, Andrea, Benford, Dominic J., Bhattacharya, Aparna, Boyd, Padi, Bozza, Valerio, Novati, Sebastiano Calchi, Carpenter, Kenneth, Cassan, Arnaud, Ciardi, David, Cole, Andrew, Colon, Knicole, Coutures, Christian, Dominik, Martin, Fouque, Pascal, Grady, Kevin, Groff, Tyler, Henderson, Calen B., Horne, Keith, Gelino, Christopher, Gelino, Dawn, Kalirai, Jason, Kane, Stephen, Kasdin, N. Jeremy, Kruk, Jeffrey, Laine, Seppo, Lambrechts, Michiel, Mancini, Luigi, Mandell, Avi, Malhotra, Sangeeta, Mao, Shude, McElwain, Michael, Mennesson, Bertrand, Meshkat, Tiffany, Moustakas, Leonidas, Munoz, Jose A., Nataf, David, Paladini, Roberta, Pascucci, Ilaria, Penny, Matthew, Poleski, Radek, Quintana, Elisa, Ranc, Clement, Rattenbury, Nicholas, Rhodes, James, Rhodes, Jason D., Rizzo, Maxime, Roberge, Aki, Rogers, Leslie, Sahu, Kailash C., Schlieder, Joshua, Seager, Sara, Shvartzvald, Yossi, Soummer, Remi, Spergel, David, Stassun, Keivan G., Street, Rachel, Sumi, Takahiro, Suzuki, Daisuke, Trauger, John, van der Marel, Roeland, Williams, Benjamin F., Wollack, Edward J., Yee, Jennifer, Yonehara, Atsunori, and Zimmerman, Neil

Subjects
Astrophysics - Earth and Planetary Astrophysics
Abstract

The Wide Field Infrared Survey Telescope (WFIRST) was the top ranked large space mission in the 2010 New Worlds, New Horizons decadal survey, and it was formed by merging the science programs of 3 different mission concepts, including the Microlensing Planet Finder (MPF) concept (Bennett \etal\ 2010). The WFIRST science program (Spergel \etal\ 2015) consists of a general observer program, a wavefront controlled technology program, and two targeted science programs: a program to study dark energy, and a statistical census of exoplanets with a microlensing survey, which uses nearly one quarter of WFIRST's observing time in the current design reference mission. The New Worlds, New Horizons (decadal survey) midterm assessment summarizes the science case for the WFIRST exoplanet microlensing survey with this statement: "WFIRST's microlensing census of planets beyond 1 AU will perfectly complement Kepler's census of compact systems, and WFIRST will also be able to detect free-floating planets unbound from their parent stars\rlap.", Comment: White paper submitted to the National Academy Committee on an Exoplanet Science Strategy; 6 pages (typo fixed)

Published
2018

3. An Isolated Stellar-mass Black Hole Detected through Astrometric Microlensing*

Author

Sahu, Kailash C., primary, Anderson, Jay, additional, Casertano, Stefano, additional, Bond, Howard E., additional, Udalski, Andrzej, additional, Dominik, Martin, additional, Calamida, Annalisa, additional, Bellini, Andrea, additional, Brown, Thomas M., additional, Rejkuba, Marina, additional, Bajaj, Varun, additional, Kains, Noé, additional, Ferguson, Henry C., additional, Fryer, Chris L., additional, Yock, Philip, additional, Mróz, Przemek, additional, Kozłowski, Szymon, additional, Pietrukowicz, Paweł, additional, Poleski, Radek, additional, Skowron, Jan, additional, Soszyński, Igor, additional, Szymański, Michał K., additional, Ulaczyk, Krzysztof, additional, Wyrzykowski, Łukasz, additional, Barry, Richard K., additional, Bennett, David P., additional, Bond, Ian A., additional, Hirao, Yuki, additional, Silva, Stela Ishitani, additional, Kondo, Iona, additional, Koshimoto, Naoki, additional, Ranc, Clément, additional, Rattenbury, Nicholas J., additional, Sumi, Takahiro, additional, Suzuki, Daisuke, additional, Tristram, Paul J., additional, Vandorou, Aikaterini, additional, Beaulieu, Jean-Philippe, additional, Marquette, Jean-Baptiste, additional, Cole, Andrew, additional, Fouqué, Pascal, additional, Hill, Kym, additional, Dieters, Stefan, additional, Coutures, Christian, additional, Dominis-Prester, Dijana, additional, Bennett, Clara, additional, Bachelet, Etienne, additional, Menzies, John, additional, Albrow, Michael, additional, Pollard, Karen, additional, Gould, Andrew, additional, Yee, Jennifer C., additional, Allen, William, additional, Almeida, Leonardo A., additional, Christie, Grant, additional, Drummond, John, additional, Gal-Yam, Avishay, additional, Gorbikov, Evgeny, additional, Jablonski, Francisco, additional, Lee, Chung-Uk, additional, Maoz, Dan, additional, Manulis, Ilan, additional, McCormick, Jennie, additional, Natusch, Tim, additional, Pogge, Richard W., additional, Shvartzvald, Yossi, additional, Jørgensen, Uffe G., additional, Alsubai, Khalid A., additional, Andersen, Michael I., additional, Bozza, Valerio, additional, Novati, Sebastiano Calchi, additional, Burgdorf, Martin, additional, Hinse, Tobias C., additional, Hundertmark, Markus, additional, Husser, Tim-Oliver, additional, Kerins, Eamonn, additional, Longa-Peña, Penelope, additional, Mancini, Luigi, additional, Penny, Matthew, additional, Rahvar, Sohrab, additional, Ricci, Davide, additional, Sajadian, Sedighe, additional, Skottfelt, Jesper, additional, Snodgrass, Colin, additional, Southworth, John, additional, Tregloan-Reed, Jeremy, additional, Wambsganss, Joachim, additional, Wertz, Olivier, additional, Tsapras, Yiannis, additional, Street, Rachel A., additional, Bramich, D. M., additional, Horne, Keith, additional, and Steele, Iain A., additional

Published
2022
Full Text
View/download PDF

4. Limits on additional planetary companions to OGLE-2005-BLG-390L

Author

Kubas, Daniel, Cassan, Arnaud, Dominik, Martin, Bennett, Dave P., Wambsganss, Joachim, Beaulieu, Jean-Philippe, Albrow, Michael D., Batista, Virginie, Bode, M., Bramich, Daniel M., Brillant, Stéphane, Burgdorf, M., Caldwell, John A. R., Calitz, Hannes, Cook, Kem H., Coutures, Christian, Dieters, Stefan, Dominis Prester, Dijana, Donatowicz, Jadzia, Fouqué, Pascal, Greenhill, John, Hill, Kym, Hoffman, Matie, Horne, Keith, Jø rgensen, Uffe G., Kains, Noe, Kane, Stephen, Marquette, Jean-Baptiste, Martin, Ralph, Meintjes, Pieter, Menzies, John, Pollard, Karen R., Sahu, Kailash C., Snodgrass, C., Steele, I., Tsapras, Y., Vinter, Christian, Williams, Andrew, Woller, Kristian, and Zub, Marta

Subjects
Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics::Earth and Planetary Astrophysics, techniques microlensing, exoplanets individual OGLE-2005-BLG-390Lb, stars M-dwarfs, stars K-dwarfs, Astrophysics::Galaxy Astrophysics
Abstract

We investigate constraints on additional planets orbiting the distant M-dwarf star OGLE-2005-BLG-390L, around which photometric microlensing data has revealed the existence of the sub-Neptune-mass planet OGLE-2005-BLG-390Lb. We specifically aim to study potential Jovian companions and compare our findings with predictions from core-accretion and disc-instability models of planet formation. We also obtain an estimate of the detection probability for sub-Neptune mass planets similar to OGLE-2005-BLG-390Lb using a simplified simulation of a microlensing experiment. We compute the efficiency of our photometric data for detecting additional planets around OGLE-2005-BLG-390L, as a function of the microlensing model parameters and convert it into a function of the orbital axis and planet mass by means of an adopted model of the Milky Way. We find that more than 50 % of potential planets with a mass in excess of 1 M_J between 1.1 and 2.3 AU around OGLE-2005-BLG-390L would have revealed their existence, whereas for gas giants above 3 M_J in orbits between 1.5 and 2.2 AU, the detection efficiency reaches 70 % ; however, no such companion was observed. Our photometric microlensing data therefore do not contradict the existence of gas giant planets at any separation orbiting OGLE-2005-BLG-390L. Furthermore we find a detection probability for an OGLE-2005-BLG-390Lb-like planet of around 2-5 %. In agreement with current planet formation theories, this quantitatively supports the prediction that sub-Neptune mass planets are common around low-mass stars.

Published
2008

5. Hunting for Frozen Super-Earths via Microlensing

Author

Beaulieu, Jean-Philippe, Albrow, Michael, Bennett, Dave, Brillang, Stéphane, Caldwell, John A. R., Calitz, Johannes J., Cassan, Arnaud, Cook, Kem H., Coutures, Christian, Dieters, Stefan, Dominik, Martin, Dominis Prester, Dijana, Donatowicz, Jadzia, Fouqué, Pascal, Greenhill, John, Hill, Kym, Hoffman, Matie, J&oslash, rgensen, Uffe G., Kane, Stephen, Kubas, Daniel, Marquette, Jean-Baptiste, Martin, Ralph, Meintjes, Pieter, Menzies, John, Pollard, Karen, Sahu, Kailash, Vinter, Christian, Wambsganss, Joachim, Williams, Andrew, Woller, Kristian, Zub, Marta, Horne, Keith, Allan, Alasdair, Bode, Mike, Bramich, Daniel M., Burgdorf, Martin, Fraser, Stephen, Mottram, Chris, Rattenbury, Nicholas, Snodgrass, Colin, Steele, Iain, and Tsapras, Yiannis

Subjects
Extrasolar planets, microlensing, Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics::Earth and Planetary Astrophysics, Astrophysics::Galaxy Astrophysics
Abstract

In order to obtain a census of planets with masses in the range of Earth to Jupiter, eight telescopes are being used by the combined microlensing campaign of the PLANET and RoboNet collaborations for high-cadence photometric round-the-clock follow-up of ongoing events, alerted by the OGLE and MOA surveys. In 2005 we detected a planet of 5.5 Earth masses at 2.6 AU from its parent 0.22 MA M star. This object is the first member of a new class of cold telluric planets. Its detection confirms the power of this method and, given our detection efficiency, suggests that these recently-detected planets may be quite common around M stars, as confirmed by subsequent detection of a ~ 13 Earth-mass planet. Using a network of dedicated 1 2-m-class telescopes, we have entered a new phase of planet discovery, and will be able to provide constraints on the abundance of frozen Super-Earths in the near future.

Published
2007

6. An Isolated Stellar-mass Black Hole Detected through Astrometric Microlensing

Author

Sahu, Kailash C., Anderson, Jay, Casertano, Stefano, Bond, Howard E., Udalski, Andrzej, Dominik, Martin, Calamida, Annalisa, Bellini, Andrea, Brown, Thomas M., Rejkuba, Marina, Bajaj, Varun, Kains, Noé, Ferguson, Henry C., Fryer, Chris L., Yock, Philip, Mróz, Przemek, Kozłowski, Szymon, Pietrukowicz, Paweł, Poleski, Radek, Skowron, Jan, Soszyński, Igor, Szymański, Michał K., Ulaczyk, Krzysztof, Wyrzykowski, Łukasz, Barry, Richard K., Bennett, David P., Bond, Ian A., Hirao, Yuki, Silva, Stela Ishitani, Kondo, Iona, Koshimoto, Naoki, Ranc, Clément, Rattenbury, Nicholas J., Sumi, Takahiro, Suzuki, Daisuke, Tristram, Paul J., Vandorou, Aikaterini, Beaulieu, Jean-Philippe, Marquette, Jean-Baptiste, Cole, Andrew, Fouqué, Pascal, Hill, Kym, Dieters, Stefan, Coutures, Christian, Dominis-Prester, Dijana, Bennett, Clara, Bachelet, Etienne, Menzies, John, Albrow, Michael, Pollard, Karen, Gould, Andrew, Yee, Jennifer C., Allen, William, Almeida, Leonardo A., Christie, Grant, Drummond, John, Gal-Yam, Avishay, Gorbikov, Evgeny, Jablonski, Francisco, Lee, Chung-Uk, Maoz, Dan, Manulis, Ilan, McCormick, Jennie, Natusch, Tim, Pogge, Richard W., Shvartzvald, Yossi, Jørgensen, Uffe G., Alsubai, Khalid A., Andersen, Michael I., Bozza, Valerio, Novati, Sebastiano Calchi, Burgdorf, Martin, Hinse, Tobias C., Hundertmark, Markus, Husser, Tim-Oliver, Kerins, Eamonn, Longa-Peña, Penelope, Mancini, Luigi, Penny, Matthew, Rahvar, Sohrab, Ricci, Davide, Sajadian, Sedighe, Skottfelt, Jesper, Snodgrass, Colin, Southworth, John, Tregloan-Reed, Jeremy, Wambsganss, Joachim, Wertz, Olivier, Tsapras, Yiannis, Street, Rachel A., Bramich, D. M., Horne, Keith, Steele, Iain A., Sahu, Kailash C., Anderson, Jay, Casertano, Stefano, Bond, Howard E., Udalski, Andrzej, Dominik, Martin, Calamida, Annalisa, Bellini, Andrea, Brown, Thomas M., Rejkuba, Marina, Bajaj, Varun, Kains, Noé, Ferguson, Henry C., Fryer, Chris L., Yock, Philip, Mróz, Przemek, Kozłowski, Szymon, Pietrukowicz, Paweł, Poleski, Radek, Skowron, Jan, Soszyński, Igor, Szymański, Michał K., Ulaczyk, Krzysztof, Wyrzykowski, Łukasz, Barry, Richard K., Bennett, David P., Bond, Ian A., Hirao, Yuki, Silva, Stela Ishitani, Kondo, Iona, Koshimoto, Naoki, Ranc, Clément, Rattenbury, Nicholas J., Sumi, Takahiro, Suzuki, Daisuke, Tristram, Paul J., Vandorou, Aikaterini, Beaulieu, Jean-Philippe, Marquette, Jean-Baptiste, Cole, Andrew, Fouqué, Pascal, Hill, Kym, Dieters, Stefan, Coutures, Christian, Dominis-Prester, Dijana, Bennett, Clara, Bachelet, Etienne, Menzies, John, Albrow, Michael, Pollard, Karen, Gould, Andrew, Yee, Jennifer C., Allen, William, Almeida, Leonardo A., Christie, Grant, Drummond, John, Gal-Yam, Avishay, Gorbikov, Evgeny, Jablonski, Francisco, Lee, Chung-Uk, Maoz, Dan, Manulis, Ilan, McCormick, Jennie, Natusch, Tim, Pogge, Richard W., Shvartzvald, Yossi, Jørgensen, Uffe G., Alsubai, Khalid A., Andersen, Michael I., Bozza, Valerio, Novati, Sebastiano Calchi, Burgdorf, Martin, Hinse, Tobias C., Hundertmark, Markus, Husser, Tim-Oliver, Kerins, Eamonn, Longa-Peña, Penelope, Mancini, Luigi, Penny, Matthew, Rahvar, Sohrab, Ricci, Davide, Sajadian, Sedighe, Skottfelt, Jesper, Snodgrass, Colin, Southworth, John, Tregloan-Reed, Jeremy, Wambsganss, Joachim, Wertz, Olivier, Tsapras, Yiannis, Street, Rachel A., Bramich, D. M., Horne, Keith, and Steele, Iain A.

Abstract

We report the first unambiguous detection and mass measurement of an isolated stellar-mass black hole (BH). We used the Hubble Space Telescope (HST) to carry out precise astrometry of the source star of the long-duration (tE ≃ 270 days), high-magnification microlensing event MOA-2011-BLG-191/OGLE-2011-BLG-0462 (hereafter designated as MOA-11-191/OGLE-11-462), in the direction of the Galactic bulge. HST imaging, conducted at eight epochs over an interval of 6 yr, reveals a clear relativistic astrometric deflection of the background star's apparent position. Ground-based photometry of MOA-11-191/OGLE-11-462 shows a parallactic signature of the effect of Earth's motion on the microlensing light curve. Combining the HST astrometry with the ground-based light curve and the derived parallax, we obtain a lens mass of 7.1 ± 1.3 M⊙ and a distance of 1.58 ± 0.18 kpc. We show that the lens emits no detectable light, which, along with having a mass higher than is possible for a white dwarf or neutron star, confirms its BH nature. Our analysis also provides an absolute proper motion for the BH. The proper motion is offset from the mean motion of Galactic disk stars at similar distances by an amount corresponding to a transverse space velocity of ∼45 km s−1, suggesting that the BH received a "natal kick" from its supernova explosion. Previous mass determinations for stellar-mass BHs have come from radial velocity measurements of Galactic X-ray binaries and from gravitational radiation emitted by merging BHs in binary systems in external galaxies. Our mass measurement is the first for an isolated stellar-mass BH using any technique.

Catalog

Books, media, physical & digital resources
See catalog results