Geronimo L. Villanueva

Comet C/2004 Q2 (Machholz): parent volatiles, a search for deuterated methane, and constraint on the CH_4 spin temperature (2009)

Bonev, Boncho P., Mumma, Michael J., Gibb, Erika L., DiSanti, Michael A., Villanueva, Geronimo L., Magee-Sauer, Karen, ...

High-dispersion (λ/δλ ≈ 25,000) infrared spectra of Comet C/2004 Q2 (Machholz) were acquired on 2004 November 28-29, and 2005 January 19 (UT dates) with the Near InfraRed echelle SPECtrograph...

A Multi-Wavelength Study of Parent Volatile Abundances in Comet C/2006 M4 (SWAN) (2009)

Disanti, Michael A., Villanueva, Geronimo L., Milam, Stefanie N., Zack, Lindsay N., Bonev, Boncho P., Mumma, Michael J., ...

Volatile organic emissions were detected post-perihelion in the long period comet C/2006 M4 (SWAN) in October and November 2006. Our study combines target-of-opportunity observations using the...

Comet C/2004 Q2 (MACHHOLZ): Parent Volatiles, a Search for Deuterated Methane, and Constraint on the CH4 Spin Temperature (2009)

Bonev, Boncho P., Mumma, Michael J., Gibb, Erika L., Disanti, Michael A., Villanueva, Geronimo L., Magee-Sauer, Karen, ...

High-dispersion (l/dl ~ 25,000) infrared spectra of Comet C/2004 Q2 (Machholz) were acquired on Nov. 28-29, 2004, and Jan. 19, 2005 (UT dates) with NIRSPEC at the Keck-2 telescope on Mauna Kea. We...

Discovery of OH in circumstellar disks around young intermediate-mass stars (2008)

Mandell, Avi M., Mumma, Michael J., Blake, Geoffrey A., Bonev, Boncho P., Villanueva, Geronimo L., Salyk, Colette

We detect emission from multiple low-excitation rovibrational transitions of OH from the two Herbig Ae stars AB Aurigae and MWC 758 in the 3.0-3.7 μm wavelength range (L band), using the NIRSPEC...

Discovery of OH in Circumstellar Disks Around Young Intermediate-Mass Stars (2008)

Mandell, Avi M., Mumma, Michael J., Blake, Goeffrey A., Bonev, Boncho P., Villanueva, Geronimo L., Salyk, Colette

We detect emission from multiple low-excitation ro-vibrational transitions of OH from the two Herbig Ae stars AB Aurigae and MWC 758 in the 3.0 - 3.7 micron wavelength range (L-band), using the...

IRCS/Subaru Observations of Water in the Inner Coma of Comet 73P-B/Schwassmann-Wachmann 3: Spatially Resolved Rotational Temperatures and Ortho-Para Ratios (2008)

Bonev, Boncho P ., Mumma, Michael J., Kawakita, Hideyo, Kobayashi, Hitomi, Villanueva, Geronimo L.

Comet 73P-B/Schwassmann-Wachmann 3 was observed with IRCS/Subaru at geocentric distance of 0.074 AU on UT 10 May 2006. Multiple H2O emission lines were detected in non-resonant fluorescence near 2.9...

A Search for Variation in the H_2O Ortho-Para Ratio and Rotational Temperature in the Inner Coma of Comet C/2004 Q2 (Machholz) (2007)

Bonev, Boncho P., Mumma, Michael J., Villanueva , Geronimo L., Disanti, Michael A., Ellis, Richard S., Magee-Sauer, Karen, ...

We present spatially resolved measurements of the rotational temperature and ortho-para ratio for H_2O in the inner coma of the Oort Cloud comet C/2004 Q2 (Machholz). Our results are based on direct...