Beth A. Biller

NICI: combining coronagraphy, ADI, and SDI (2008)

Artigau, Etienne, Biller, Beth A., Wahhaj, Zahed, Hartung, Markus, Hayward, Thomas L., Close, Laird M., ...

The Near-Infrared Coronagraphic Imager (NICI) is a high-contrast AO imager at the Gemini South telescope. The camera includes a coronagraphic mask and dual channel imaging for Spectral Differential...

Constraints on extrasolar planet populations from VLT NACO/SDI and MMT SDI and direct adaptive optics imaging surveys: giant planets are rare at large separations (2008)

Nielsen, Eric L., Close, Laird M., Biller, Beth A., Masciadri, Elena, Lenzen, Rainer

We examine the implications for the distribution of extrasolar planets based on the null results from two of the largest direct imaging surveys published to date. Combining the measured contrast...

Constraints on Extrasolar Planet Populations from VLT NACO/SDI and MMT SDI and Direct Adaptive Optics Imaging Surveys: Giant Planets are Rare at Large Separations (2007)

Nielsen, Eric L., Close, Laird M., Biller, Beth A., Masciadri, Elena, Lenzen, Rainer

We examine the implications for the distribution of extrasolar planets based on the null results from two of the largest direct imaging surveys published to date. Combining the measured contrast...

The very nearby M/T dwarf binary SCR 1845-6357 (2007)

Kasper, Markus, Biller, Beth A., Burrows, Adam, Brandner, Wolfgang, Budaj, Jano, Close, Laird M.

The recently discovered star SCR 1845-6357 is the first late M/T dwarf binary discovered. SCR 1845 is a particular object due to its tight orbit (currently around 4 AU) and its proximity to the Sun...

An Imaging Survey for Extrasolar Planets around 45 Close, Young Stars with SDI at the VLT and MMT (2007)

Biller, Beth A., Close, Laird M., Masciadri, Elena, Nielsen, Eric, Lenzen, Rainer, Brandner, Wolfgang, ...

We present the results of a survey of 45 young (

An imaging survey for extrasolar panets around 45 close, young stars with the simultaneous differential imager at the Very Large Telescope and MMT (2007)

Biller, Beth A., Close, Laird M., Masciadri, Elena, Nielsen, Eric, Lenzen, Rainer, Brandner, Wolfgang, ...

We present the results of a survey of 45 young (

Resolving the Dusty Circumstellar Structure of the Enigmatic Symbiotic Star CH Cygni with the MMT Adaptive Optics System (2006)

Biller, Beth A., Close, Laird M., Li, Aigen, Marengo, Massimo, Bieging, John H., Hinz, Phil M., ...

We imaged the symbiotic star CH Cyg and two PSF calibration stars using the unique 6.5m MMT deformable secondary adaptive optics system. Our high-resolution (FWHM=0.3"), very high Strehl (98%+-2%)...

Suppressing Speckle Noise for Simultaneous Differential Extrasolar Planet Imaging (SDI) at the VLT and MMT (2006)

Biller, Beth A., Close, Laird M., Lenzen, Rainer, Brandner, Wolfgang, McCarthy, Donald, Nielsen, Eric, ...

We discuss the instrumental and data reduction techniques used to suppress speckle noise with the Simultaneous Differential Imager (SDI) implemented at the VLT and the MMT. SDI uses a double...

A Survey of Close, Young Stars with the Simultaneous Differential Imager (SDI) at the VLT and MMT (2006)

Biller, Beth A., Close, Laird M., Masciadri, Elena, Lenzen, Rainer, Brandner, Wolfgang, McCarthy, Donald, ...

We discuss the preliminary results of a survey of young ( 10 mag, Delta H > 11.5 mag for a T6 spectral type) at a separation of 0.5" from the primary star. With this degree of attenuation, we should...

Contrast limits with the Simultaneous Differential Extrasolar Planet Imager (SDI) at the VLT and MMT (2006)

Biller, Beth A., Close, Laird M., Masciadri, Elena, Lenzen, Rainer, Brandner, Wolfgang, McCarthy, Donald, ...

We discuss contrast limits obtained during a survey of young (10 mag, DeltaH>10.6 mag for a T6 spectral type) at a separation of 0.5" from the primary star. With this degree of attenuation, we can...

A Survey of close, young stars with SDI at the VLT and MMT (2006)

Biller, Beth A., Close, Laird M., Masciadri, Elena, Lenzen, Rainer, Brandner, Wolfgang, McCarthy, Donald, ...

Suppressing Speckle Noise for simultaneous differential extrasolar planet imaging (SDI) at the VLT and MMT (2006)

Biller, Beth A., Close, Laird M., Lenzen, Rainer, Brandner, Wolfgang, McCarthy, Donald, Nielsen, Eric, ...

We discuss the instrumental and data reduction techniques used to suppress speckle noise with the Simultaneous Differential Imager (SDI) implemented at the VLT and the MMT. SDI uses a quad filter to...

Suppressing speckle noise for simultaneous differential extrasolar planet imaging (SDI) at the VLT and MMT (2004)

Biller, Beth A., Close, Laird, Lenzen, Rainer, Brandner, Wolfgang, McCarthy, Donald W., Nielsen, Eric, ...