mountain profile Institute for Astronomy University of Hawaii


Current Work

"Characterizing Circumstellar Disks at 5 Myr - a Multiwavelength Gas and Dust Survey in Upper Scorpius"

Circumstellar disks, a byproduct of the star formation process, are the birthplace of planets. Examination of these disks inform our theories of planet formation by constraining the available gas and dust.

I am using millimeter photometry to measure the circumstellar dust mass in a group of 5 Myr old stars in Upper Scorpius, as well as far-infrared and millimeter gas-line spectroscopy to determine the gas content. My observations indicate that by the age of Upper Scorpius, less than 2% of stars could form giant planets. When compared to the field giant planet fraction - ~20% - this suggests that giant planet formation is essentially complete by 5 million years.

Below are links to selected papers and talks.

Selected Papers

Howard, C.D., Sandell, G., Vacca, W.D., et al. 5th author, ApJ, forthcoming. Herschel / PACS survey of protoplanetary disks in Taurus / Auriga: Investigating the source of [OI] 63 micron line emission

Mathews, G.S., Pinte, C., Duchene, G., Williams, J.P., & Menard, F., A&A, forthcoming. Diminishing gas and dust: A Herschel PACS survey of Upper Scorpius

Mathews, G.S., Klaassen, P.D., Juhasz, A., et al., A&A, forthcoming. The DCO+ Ring of HD 163296: Resolving the CO snowline with ALMA

van der Marel, N., van Dishoeck, E.F., Bruderer, S., et al. 11th author, 2013, Science, 340, 1199. A major asymmetric dust trap in a transition disk ADS

Klaassen, P. D., Juhasz, A., Mathews, G. S., et al., 2013, A&A, 555, 73. ALMA detection of the rotating molecular disk wind from the young star HD 163296 ADS

Dent, W.R.F., Thi, W.F., Kamp, I., et al. 27th author, 2013, PASP, 125, 477 GASPS - a Herschel survey of gas and dust in Protoplanetary Disks: Summary and Initial Statistics ADS

Cieza, L. A., Lacour, S., Schreiber, M. R., et al. 6th author, 2013, ApJ, 762, 12. Sparse Aperture Masking Observations of the FL Cha Pre-transitional Disk ADS

Mathews, G.S., Williams, J.P., and Menard, F., 2012, ApJ, 753, 59. 880 micron Imaging of a Transitional Disk in Upper Scorpius: Holdover from the Era of Giant Planet Formation? ADS

Mathews, G.S., Williams, J.P., Menard, F., et al., 2012, ApJ, 745, 23. The Late Stages of Protoplanetary Disk Evolution: A Millimeter Survey of Upper Scorpius ADS

Mathews, G.S., Dent., W.R.F., Williams, J.P., et al., 2010, A&A, 518, 127. Gas in Protoplanetary Systems (GASPS). I. First Results ADS

Meeus, G., Pinte, C., Woitke, P., et al. 8th author, 2010, A&A, 518, 124. Gas in the protoplanetary disk of HD 169142: Herschel's view ADS

Thi, W.F., Mathews, G.S., Menard, F., et al., 2010, A&A, 518, 125. Herschel- PACS observation of the 10 Myr old T Tauri disk TW Hya. Constraining the disk gas mass ADS

Pinte, C., Woitke, P., Menard, F., et al. 7th author, 2010, A&A, 518, 126. The Herschel view of gas in Protoplanetary Systems (GASPS). First comparisons with a large grid of models ADS

Cieza, L.A., Swift, J.J., Mathews, G.S., & Williams, J.P., 2008, ApJL, 686, 115. The Masses of Transition Circumstellar Disks: Observational Support for Photoevaporation Models ADS


Transformational Science with ALMA: from Dust to Rocks to Planets, "The One Ring: Tracing the CO snowline of HD 163296 with DCO+".

AAS Dissertation Talk, "Out of Gas: Upper Scorpius and the End of Giant Planet Formation". (pdf)