Search

Your search keyword '"Oppenheimer, Ben R."' showing total 45 results
Start Over Author "Oppenheimer, Ben R." Language english
45 results on '"Oppenheimer, Ben R."'

2. TPF-C : status and recent progress

Author

Traub, Wesley A, Levine, Marie, Shaklan, Stuart, Kasting, James, Angel, J. Roger, Brown, Michael E, Brown, Robert A, Burrows, Christopher, Clampin, Mark, Dressler, Alan, Ferguson, Henry C, Hammel, Heidi B, Heap, Sara R, Horner, Scott D, Illingworth, Garth D, Kasdin, N. Jeremy, Kuchner, Mark J, Lin, Douglas, Marley, Mark S, Meadows, Victoria, Noecker, Charley, Oppenheimer, Ben R, Seager, Sara, Shao, Seager, Shao, Michael, Stapelfeldt, Karl R, and Trauger, John T

Published
2006

4. Overview of Technologies for Direct Optical Imaging of Exoplanets

Author

Levine, Marie, Soummer, Remi, Arenberg, Jon, Belikov, Ruslan, Bierden, Paul, Boccaletti, Anthony, Brown, Robert, Burrows, Adam, Burrows, Chris, Cady, Eric, Cash, Webster, Clampin, Mark, Cossapakis, Costas, Crossfield, Ian, Dewell, Larry, Egerman, Robert, Fergusson, Henry, Ge, Jian, Give'On, Amir, Guyon, Oliver, Heap, Sara, Hyde, Tupper, Jaroux, B., Jasdin, Jeremy, Kasting, Jim F., Kenworthy, Matthew A., Kilston, Steve, Klavins, Andy, Krist, John, Kuchner, Marc, Lane, Benjamin, Lillie, Chuck, Lyon, Rick, Lloyd, James P., Lo, Amy, Lowrance, Patrick, Macintosh, Patrick J., Mccully, Sean, Marley, Mark S., Marois, Christian, Matthews, Gary, Mawet, Dimitri, Mazin, Ben, Mosier, Gary, Noecker, Charley, Pueyo, Laurent, Oppenheimer, Ben R., Pedreiro, Nelson, Postman, Marc, Roberge, Aki, Ridgway, Stephen, Schneider, Jean, Serabyn, Eugene, Shaklan, Stuart, Shao, Michael, Sivaramakrishnan, Anand, Spergel, David N., Stapelfeldt, Karl R., Tamura, Motohide, Tenerelli, Domenick, Tolls, Volker, Traub, Wesley A., Trauger, John T., Vanderbei, Robert J., Wynn, Jeff, Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Pôle Astronomie du LESIA, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris

Subjects
[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract

International audience

Published
2009

5. Direct Detection of Brown Dwarf Companions of Nearby Stars

Author

Oppenheimer, Ben R.

Subjects
Astronomy, brown dwarf
Abstract

This thesis presents the first direct detection of a substellar companion of a star other than the Sun. This object, a brown dwarf called Gliese 229B, presented a unique opportunity to characterize low-temperature brown dwarfs for the first time. The discovery and initial spectrum of Gliese 229B show that the object must be substellar based on its intrinsic luminosity of 6.4 x 10-6 L☉ and its cool surface temperature, 900 K. Detailed study of Gliese 229B includes extensive photometric measurements from 0.5 to 12 µm, high signal-to-noise ratio spectroscopy from 0.84 to 5.0 µm and the detection of 0".1 yr -1 of orbital motion. These results are presented in Chapters 2 and 3. A detailed review of brown dwarf science leads to a complete and scientifically meaningful definition of the classes "planet" and "brown dwarf" in Chapter 1. After the discovery of Gliese 229B, which was found in a survey for companions of young stars, we began an extensive search for brown dwarf companions in orbit about all known stars within 8 pc of the Sun and with δ > -35°. The search includes optical coronagraphic and infrared direct imaging of these stars, conducted on the Palomar 60" and 200" telescopes respectively. The search was designed to find companions of each star without color bias. While the search revealed no other brown dwarf companions of these stars, it did uncover 6 new stellar companions. The sensitivity limits of the survey permit the detection of brown dwarfs up to four magnitudes fainter than Gliese 229B around 90% of the stars. The sensitivity is, however, not-uniform spatially or from star to star. This limits our ability to make strong statements about the prevalence of brown dwarf companions of nearby stars. The survey does have sensitivity to all stellar companions between 3 and 30" from the survey stars, however. Chapter 5 describes related work on very low-mass stars in the Pleiades star cluster. This optical spectroscopy involved trying to find a brown dwarf member of the Pleiades by identifying lithium absorption features. We revealed no brown dwarf members of the Pleiades but did discover two members with ages much younger than the age of the Pleiades (120 Myr). We provide an adequate explanation for the presence of these stars. The three appendices summarize work conducted in association with the Palomar Adaptive Optics System. The work includes (1) the detailed study and characterization of the deformable mirror, (2) invention of a fast calibration scheme for the deformable mirror and (3) the design and implementation of the fast steering mirror.

Published
1999
Full Text
View/download PDF

6. The Gemini Planet Imager coronagraph testbed.

Author

Soummer, Rémi, Sivaramakrishnan, Anand, Oppenheimer, Ben R., Roberts, Robin, Brenner, Douglas, Carlotti, Alexis, Pueyo, Laurent, Macintosh, Bruce, Bauman, Brian, Saddlemyer, Les, Palmer, David, Erickson, Darren, Dorrer, Christophe, Caputa, Kris, Marois, Christian, Wallace, Kent, Griffiths, Emily, and Mey, Jacob

Published
2009
Full Text
View/download PDF

10. The Lyot project: toward exoplanet imaging and spectroscopy.

Author

Oppenheimer, Ben R., Digby, Andrew P., Newburgh, Laura, Brenner, Douglas, Shara, Michael, Mey, Jacob, Mandeville, Charles, Makidon, Russell B., Sivaramakrishnan, Anand, Soummer, Remi, Graham, James R., Kalas, Paul, Perrin, Marshall D., Roberts Jr., Lewis C., Kuhn, Jeffrey R., Whitman, Kathryn, and Lloyd, James P.

Published
2004
Full Text
View/download PDF

19. THE κ ANDROMEDAE SYSTEM: NEW CONSTRAINTS ON THE COMPANION MASS, SYSTEM AGE, AND FURTHER MULTIPLICITY.

Author

Hinkley, Sasha, Pueyo, Laurent, Faherty, Jacqueline K., Oppenheimer, Ben R., Mamajek, Eric E., Kraus, Adam L., Rice, Emily L., Ireland, Michael J., David, Trevor, Hillenbrand, Lynne A., Vasisht, Gautam, Cady, Eric, Brenner, Douglas, Veicht, Aaron, Nilsson, Ricky, Zimmerman, Neil, Parry, Ian R., Beichman, Charles, Dekany, Richard, and Roberts, Jennifer E.

Subjects
BROWN dwarf stars, DWARF stars, RADIAL velocity of galaxies, SPECTROSCOPIC imaging, PLANETARY mass
Abstract

κ Andromedae is a B9IVn star at 52 pc for which a faint substellar companion separated by 55 ± 2 AU was recently announced. In this work, we present the first spectrum of the companion, “κ And B,” using the Project 1640 high-contrast imaging platform. Comparison of our low-resolution YJH-band spectra to empirical brown dwarf spectra suggests an early-L spectral type. Fitting synthetic spectra from PHOENIX model atmospheres to our observed spectrum allows us to constrain the effective temperature to ∼2000 K as well as place constraints on the companion surface gravity. Further, we use previously reported log(g) and Teff measurements of the host star to argue that the κ And system has an isochronal age of 220 ± 100 Myr, older than the 30 Myr age reported previously. This interpretation of an older age is corroborated by the photometric properties of κ And B, which appear to be marginally inconsistent with other 10-100 Myr low-gravity L-dwarfs for the spectral type range we derive. In addition, we use Keck aperture masking interferometry combined with published radial velocity measurements to rule out the existence of any tight stellar companions to κ And A that might be responsible for the system's overluminosity. Further, we show that luminosity enhancements due to a nearly “pole-on” viewing angle coupled with extremely rapid rotation is unlikely. κ And A is thus consistent with its slightly evolved luminosity class (IV), and we propose here that κ And, with a revised age of 220 ± 100 Myr, is an interloper to the 30 Myr Columba association with which it was previously associated. The photometric and spectroscopic evidence for κ And B combined with our reassessment of the system age implies a substellar companion mass of 50 MJup, consistent with a brown dwarf rather than a planetary-mass companion. [ABSTRACT FROM AUTHOR]

Published
2013
Full Text
View/download PDF

20. HIGH-RESOLUTION INFRARED IMAGING AND SPECTROSCOPY OF THE Z CANIS MAJORIS SYSTEM DURING QUIESCENCE AND OUTBURST.

Author

HINKLEY, SASHA, HILLENBRAND, LYNNE, OPPENHEIMER, BEN R., RICE, EMILY L., PUEYO, LAURENT, VASISHT, GAUTAM, ZIMMERMAN, NEIL, KRAUS, ADAM L., IRELAND, MICHAEL J., BRENNER, DOUGLAS, BEICHMAN, CHARLES, DEKANY, RICHARD, ROBERTS, JENNIFER E., PARRY, IAN R., ROBERTS JR., LEWIS C., CREPP, JUSTIN R., BURRUSS, RICK, WALLACE, J. KENT, CADY, ERIC, and CHENGXING ZHAI

Published
2013
Full Text
View/download PDF

24. SPECTRAL TYPING OF LATE-TYPE STELLAR COMPANIONS TO YOUNG STARS FROM LOW-DISPERSION NEAR-INFRARED INTEGRAL FIELD UNIT DATA.

Author

Roberts Jr., Lewis C., Rice, Emily L., Beichman, Charles A., Brenner, Douglas, Burruss, Rick, Crepp, Justin R., Dekany, Richard G., Hillenbrand, Lynne A., Hinkley, Sasha, Ligon, E. Robert, Lockhart, Thomas G., King, David, Metchev, Stanimir, Oppenheimer, Ben R., Parry, Ian R., Pueyo, Laurent, Roberts, Jennifer E., Shao, Michael, Sivaramakrishnan, Anand, and Soummer, Rémi

Published
2012
Full Text
View/download PDF

30. PARALLACTIC MOTION FOR COMPANION DISCOVERY: AN M-DWARF ORBITING ALCOR.

Author

Zimmerman, Neil, Oppenheimer, Ben R., Hinkley, Sasha, Brenner, Douglas, Parry, Ian R., Sivaramakrishnan, Anand, Hillenbrand, Lynne, Beichman, Charles, Crepp, Justin R., Vasisht, Gautam, Jr, Lewis C. Roberts, Burruss, Rick, King, David L., Soummer, Rémi, Dekany, Richard, Shao, Michael, Bouchez, Antonin, Roberts, Jennifer E., and Hunt, Stephanie

Published
2010
Full Text
View/download PDF

31. The Lyot Project: status and results

Author

Sivaramakrishnan, Anand, Oppenheimer, Ben R., Hinkley, Sasha, Brenner, Douglas, Soummer, Rémi, Mey, Jacob L., Lloyd, James P., Perrin, Marshall D., Graham, James R., Makidon, Russell B., Roberts, Lewis C., and Kuhn, Jeffrey R.

Subjects
*CORONAGRAPHS, *TELESCOPES, *ADAPTIVE optics, *MOUNTAINS
Abstract

Abstract: We present a retrospective on, and some new imaging data from The Lyot Project JHK coronagraph which is used behind the 3.6 m AEOS 941-channel AO telescope on Mt. Haleakala, on the island of Maui in Hawaii. This instrument is the first ‘extreme adaptive optics’ (ExAO) coronagraph ever; it opens up new scientific search spaces in direct imaging of faint companions of nearby stars. It also blazed a trail for current ExAO systems being developed for ESO-VLT and Gemini telescopes. Amongst other things, the Lyot Project has been used to demonstrate a device for precision coronagraphic astrometry and photometry using the novel technique of placing a wire grid over the pupil to create stable fiducial ghost images, to show the effects of frozen actuators on a deformable mirror, to refine angular differential imaging for use on the Coudé focus of Alt-Az telescopes, and to develop a coronagraphic data reduction pipeline. To cite this article: A. Sivaramakrishnan et al., C. R. Physique 8 (2007). [Copyright &y& Elsevier]

Published
2007
Full Text
View/download PDF

32. Apodized Pupil Lyot Coronagraphs: Concepts and application to the Gemini Planet Imager.

Author

Soummer, Rémi, Aime, Claude, Ferrari, André, Sivaramakrishnan, Anand, Oppenheimer, Ben R., Makidon, Russell, and Macintosh, Bruce

Abstract

This paper summarizes the general theory and properties for Apodized Pupil Lyot Coronagraphs which consist of a classical hard-edged Lyot coronagraph with an upstream pupil apodization. The ideal apodization function can be determined from an integral eigenvalue problem which solutions are prolate spheroidal functions. Solutions exist for any geometrty, including rectangular, circular, or elliptical. Formal solutions can be extended to the case of arbitrary apertures, using generalized prolate spheroidal functions for centrally obstructed apertures, spiders, or segmented telescopes. The properties of these coronagraphs enable the possibility of multiple stage coronagraphy and achromatization. The new instrument Gemini Planet Imager (GPI) will include such a coronagraph. [ABSTRACT FROM PUBLISHER]

Published
2005
Full Text
View/download PDF

33. WHITE DWARFS BY THE BILLIONS.

Author

Oppenheimer, Ben R.

Subjects
*STAR observations, *WHITE dwarf stars, *MILKY Way, *DWARF stars, *SPECTRUM analysis
Abstract

Deals with several studies on white dwarfs which account for a significant portion of the dark matter in the Milky Way galaxy. Details on the spherical halo in the disk of the Milky Way; Result of a microlensing experiment of the MAssive Compact Halo Object project; Reasons for the bluing effect in white dwarfs.

Published
2001

34. CONSTRAINING MASS RATIO AND EXTINCTION IN THE FU ORIONIS BINARY SYSTEM WITH INFRARED INTEGRAL FIELD SPECTROSCOPY.

Author

Pueyo, Laurent, Hillenbrand, Lynne, Vasisht, Gautam, Oppenheimer, Ben R., Monnier, John D., Hinkley, Sasha, Crepp, Justin, Roberts, Jr. Lewis C., Brenner, Douglas, Zimmerman, Neil, Parry, Ian, Beichman, Charles, Dekany, Richard, Shao, Mike, Burruss, Rick, Cady, Eric, Roberts, Jenny, and Soummer, Rémi

Subjects
BINARY stars, NEAR infrared spectroscopy, INTEGRAL field spectroscopy, PROTOSTARS, IMAGING systems in astronomy
Abstract

We report low-resolution near-infrared spectroscopic observations of the eruptive star FU Orionis using the Integral Field Spectrograph (IFS) Project 1640 installed at the Palomar Hale telescope. This work focuses on elucidating the nature of the faint source, located 0.″5 south of FU Ori, and identified in 2003 as FU Ori S. We first use our observations in conjunction with published data to demonstrate that the two stars are indeed physically associated and form a true binary pair. We then proceed to extract J- and H-band spectro-photometry using the damped LOCI algorithm, a reduction method tailored for high contrast science with IFS. This is the first communication reporting the high accuracy of this technique, pioneered by the Project 1640 team, on a faint astronomical source. We use our low-resolution near-infrared spectrum in conjunction with 10.2 μm interferometric data to constrain the infrared excess of FU Ori S. We then focus on estimating the bulk physical properties of FU Ori S. Our models lead to estimates of an object heavily reddened, AV = 8-12, with an effective temperature of ∼4000-6500 K. Finally, we put these results in the context of the FU Ori N-S system and argue that our analysis provides evidence that FU Ori S might be the more massive component of this binary system. [ABSTRACT FROM AUTHOR]

Published
2012
Full Text
View/download PDF

35. ESTABLISHING α Oph AS A PROTOTYPE ROTATOR: IMPROVED ASTROMETRIC ORBIT.

Author

Hinkley, Sasha, Monnier, John D., Oppenheimer, Ben R., Roberts Jr., Lewis C., Ireland, Michael, Zimmerman, Neil, Brenner, Douglas, Parry, Ian R., Martinache, Frantz, Lai, Olivier, Soummer, Rémi, Sivaramakrishnan, Anand, Beichman, Charles, Hillenbrand, Lynne, Zhao, Ming, Lloyd, James P., Bernat, David, Vasisht, Gautam, Crepp, Justin R., and Pueyo, Laurent

Published
2011
Full Text
View/download PDF

36. DISCOVERY AND CHARACTERIZATION OF A FAINT STELLAR COMPANION TO THE A3V STAR ζ VIRGINIS.

Author

Hinkley, Sasha, Oppenheimer, Ben R., Brenner, Douglas, Zimmerman, Neil, Roberts Jr., Lewis C., Parry, Ian R., Soummer, Rémi, Sivaramakrishnan, Anand, Simon, Michal, Perrin, Marshall D., King, David L., Lloyd, James P., Bouchez, Antonin, Roberts, Jennifer E., Dekany, Richard, Beichman, Charles, Hillenbrand, Lynne, Burruss, Rick, Shao, Michael, and Vasisht, Gautam

Published
2010
Full Text
View/download PDF

38. The Solar-System-Scale Disk around AB Aurigae.

Author

Oppenheimer, Ben R., Brenner, Douglas, Hinkley, Sasha, Zimmerman, Neil, Sivaramakrishnan, Anand, Soummer, Remi, Kuhn, Jeffrey, Graham, James R., Perrin, Marshall, Lloyd, James P., Roberts, Jr., Lewis C., and Harrington, David M.

Published
2008
Full Text
View/download PDF

39. The Gemini Deep Planet Survey.

Author

Lafrenière, David, Doyon, René, Marois, Christian, Nadeau, Daniel, Oppenheimer, Ben R., Roche, Patrick F., Rigaut, François, Graham, James R., Jayawardhana, Ray, Johnstone, Doug, Kalas, Paul G., Macintosh, Bruce, and Racine, René

Published
2007
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results