Michael L. Sitko

Department of Physics, University of Cincinnati

"Leadership derives from strength of character, not opinion polls and focus groups. The other should be called followership."


My interests center around the nature of interstellar, circumstellar, and interplanetary dust grains, and the role they play in the formation of planetary systems. In the past few years I have been investigating the emission characteristics of the grains in the dusty disks surrounding young stars, and how they are evolving as the stellar systems age. The particle sizes and compositions are being compared to those of the diffuse interstellar medium, cometary grains of our own solar system, and dust grains condensed in the laboratory. Most of my recent observational work has been carried out with the Broadband Array Spectrograph System (BASS) of The Aerospace Corporation on the NASA Infrared Telescope Facility.

What’s the life of an astronomer really like? To see what a typical observing session at the IRTF is like, go here, or see another group’s video


A Short Vita

Archive of Published Mid-IR Spectra and Mike's SpeX Data Reduction Manual (v2) (34 MB pdf)

ADS Search of All of My Publications

ADS Search of My Refereed Publications

Scientific Background: The Formation and Evolution of Solar Systems

Astronomy at UC

Comet 73P/Schwassmann-Wachmann 3

In 2005 I also became an off-site employee of the Space Science Institute.


Web Sites for Some Important Planetary Missions

Mars Global Surveyor

Mars Odyssey

Mars Express

Mars Rovers

Phoenix Mars Mission at U of AZ

Phoenix Mars Mission at JPL

Phoenix Mars Mission NASA HQ’s

Mars Reconnaissance Orbiter

Messenger to Mercury

Stardust - The First Comet Sample Return Mission

Deep Impact - Shooting a Comet

Rosetta - Landing on a Comet

New Horizons Pluto-Kuiper Belt Probe

Cassini Mission to Saturn

Venus Express


Web Sites for Some Important Space Astronomy Missions

Hubble Space Telescope (HST)

Far Ultraviolet Spectroscopic Explorer (FUSE)

Galaxy Evolution Explorer (GALEX)

Spitzer Space Telescope

Chandra X-ray Observatory

Wide-field Infrared Survey Explorer (WISE)


Numerous young stars show spectroscopic evidence for what would seem to be stargrazing comets. Such objects were routinely observed hitting the Sun, using coronagraphic images taken by the SOHO satellite. The solar system today is very empty compared to these other systems, and the collision rate much lower by many orders of magnitude

Sungrazing Comets Observed with SOHO – 1000 Comets, and counting……


The Cincinnati Observatory Center

The country's oldest operating observatory is right here in Cincinnati.

Astronomy Picture of the Day

2003 UB313 - 10th Planet or Kuiper Belt Object? - You Decide

Teaching Pigs to Sing – By Harriet Hall (reprinted with permission of the author & Skeptical Inquirer)

Cargo Cult Science – from Richard P. Feynman’s “Surely You’re Joking, Mr. Feynman”

Judging Books by their Covers – another amusing tale from Feynman


Astronomy: Stars and Galaxies - Winter 2006

Astronomy Lab Syllabus - Winter 2008 

Astronomy Lab Syllabus - Fall 2007

Astronomy Lab Syllabus - Spring 2008

Reflectance Spectroscopy - Introduction to the ALTA Spectrometer

Astronomy: Life in the Universe              (old - Spring 2006)

Astronomy: Life in the Universe Winter 2008

Astronomy: Life in the Universe Spring 2008  Syllabus

Astronomy: Life in the Universe Spring 2009 Syllabus

Advanced Topics in Astronomy (341)  Spring 2004

Advanced Topics in Astronomy (341) Spring 2007

Astrophysics-I (521&821)            Fall 2008 Syllabus

Astrophysics-II (522&822)          Winter 2009 Syllabus

Summer 2007 Seminar on Cosmic Dust

Summer 2004 lecture on SETI

Great Women in Astronomy and Other Stuff


Workshop: Thermal Emission Spectroscopy and Analysis of Dust, Disks, and Regoliths

A workshop held at the Lunar and Planetary Institute, Houston TX, April 28-30 1999. Organized by Ann Sprague, David Lynch, and myself. Published in 2000 as Volume 196 of the ASP Conference Series.


Representative Papers:

Conference Proceedings

"Comparison of Collected Interplanetary Dust Particles with Dust in Space", J.P. Bradley, L.P. Keller, G.J. Flynn, and M.L. Sitko, 2000, in "Thermal Emission Spectroscopy and Analysis of Dust, Disks, and Regoliths", ASP Conf. Ser. 196, eds. M.L. Sitko, A.L. Sprague, and D.K. Lynch, pp.119-125.

Thermal Emission Indicatrix for Rough Planetary Surfaces at Arbitrary Heatong/Observing Geometries", Yu. Shkuratov, D. Stankevich, M.L. Sitko, and A.L. Sprague, 2000, in "Thermal Emission Spectroscopy and Analysis of Dust, Disks, and Regoliths", ASP Conf. Ser. 196, eds. M.L. Sitko, A.L. Sprague, and D.K. Lynch, pp. 221-230.

 

"Infalling Planetesimals in Pre-Main Sequence Stellar Systems", C.A Grady, M.L. Sitko, R.W. Russell, D.K. Lynch, M.S. Hanner, M.R. Perez, K.S. Bjorkman, and D. de Winter, 2000, "Protostars and Planets IV", eds. V. Mannings, A. Boss, and S. Russell, University of Arizona Press, p. 613-638.

"Astro-Mineralogy: The Comparison of Infrared Spectra from Astrophysical Environments with those from Interplanetary Dust Particles (IDPs)", F.J. Molster, J.P. Bradley, M.L. Sitko, and J.A. Nuth, 2001, LPSC 32.

 

“Models of Accretrion Disks around Young Stars”, P. D’Alessio, N. Calvet, L. Hartmann, J. Muzerolle, and M. Sitko, Star Formation at High Angular Resolution, IAU Symposium 221, eds. M.G. Burton, R. Jayawardhana, & T.L. Bourke, p. 403-410  (2004).

 

Journals

 

"3- to 14-micron Spectroscopy of Comet 55P/Tempel-Tuttle, Parent Body of the Leonid Meteors", D.K. Lynch, R.W. Russell, and M.L. Sitko, 2000, Icarus, 144, 187-190.

 

"3- to 14-micron Spectroscopy of Comet C/1999 T1 (McNaught-Hartley)", D.K. Lynch, R.W. Russell, and M.L. Sitko, 2002, Icarus, 159, 234-238.

"Evidence for a Developing Gap in a 10 Myr Old Protoplanetary Disk", N. Calvet, P. D'Alessio, L. Hartmann, D. Wilner, A. Walsh, and M. Sitko, 2002, ApJ, 568, 1008-1016.

 

"0.8-13 Micron Spectroscopy of V838 Mononcerotis and a Model for its Emission"  D.K. Lynch, R.J. Rudy, R.W. Russell, C.C. Venturini, W. Dimpfl, L.S. Bernstein, M.L. Sitko, S. Fajardo-Acosta, A. Tokunaga, R. Knacke, R.C. Puetter, and R.B. Perry, 2004, ApJ, 607, 460-473.

"A New probe of the Planet-Forming Region in T Tauri Disks",E. Bergin, N. Calvet, M.L. Sitko, H. Abgrall, P. D'Alessio, G.J. Herczeg, E. Roueff, C. Qi, D.K. Lynch, R.W. Russell, S.M. Brafford, and R.B. Perry, 2004, ApJ, 614, L133-L136.

 

 

 

 

 

"3-14 Micron Spectroscopy of Comets C/2002 O4 (Honig), C/2002 V1 (NEAT), C/2002 X5 (Kudo-Fujikawa), C/2002 Y1 (Juels-Holvorcem), and 69P/Taylor and the Relationships among Grain Temperature, Silicate Band Strength, and Structure among Comet Families", M.L. Sitko, D.K. Lynch, R.W. Russell, and M.S. Hanner, 2004, ApJ, 612, 576-587.

 

 

 

"Dust Morphology and Composition in FU Orionis Stars”, E.F. Polomski, C.E. Woodward, C.E. Telesco, R. Piña, H. Butner, E. Holmes, D.K. Lynch, R.W. Russell, M.L. Sitko, and D.H. Wooden, AJ, 129, 1035-1048 (2005).

 

Coronagraphic Imaging of pre-Main-Sequence Stars with the Hubble Space Telescope Space Telescope Imaging Spectrograph. I. The Herbig Stars’, C.A. Grady, B.E. Woodgate, C.W. Bowers, T.R. Gull, M.L. Sitko, W.J. Carpenter, D.K. Lynch, R.W.Russell, R.B. Perry, G.M. Williger, A. Roberge, J.-C. Bouret, and M. Sahu, ApJ, 630, 958 (2005).

 

“Early Spectral Development of V1187 Scorpii (Nova Scorpii 2004 No. 2)”, D.K. Lynch, C.E. Woodwrad, T.R. Geballe, R.W. Russell, R.J. Rudy, C.C. Venturini, G.J. Schwarz, R.D. Gehrz, N. Smith, J.E. Lyke, S.J. Bus, M.L. Sitko, T.E. Harrison, S. Fisher, S.P. Eyres, A. Evans, S.N. Shore, S. Starrfield, M.F. Bode, M.A. Greenhouse, P.H. Hauschildt, J.W. Truran, R.E. Williams, R.Brad Berry, R. Zamanov, and T.J. O'Brien. ApJ 638, 987 (2006).

 

Other

 

 

 

 

"Constraints on Nebular Dynamics and Chemistry based on Observations of Annealed Magnesium Silicate Grains in Comets and Disks Surrounding Herbig Ae/Be Stars", H.G.M. Hill, C.A. Grady, J.A. Nuth, III, S.L. Hallenbeck, and M.L. Sitko, 2001, Pub. Nat. Acad. Sci., vol. 98, no. 5, pp. 2182-2187.

 

 


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