Eric Mamajek
Associate Professor
Dept. of Physics and Astronomy
University of Rochester
emamajek pas rochester edu

Artist's conception of J1407 eclipsing ring system by illustrator Ron Miller

UR: Physics & Astronomy Department, UR Physics & Astronomy Major & Minor, Advice for students, Graduate Program, PHY & AST courses, UR Physics & Astro Visitor's Info, Mees Observatory Summer Tours, Mees Documentation

Stars: Online Material, Stellar Color/Teff Table, MK Spectral Type Notes, Notes on the Sun

Publications: Curriculum Vitae, Press, Google Scholar, ResearchGate, sorted by # of citations, 1st-author only sorted by # citations, sorted by date, astro-ph submissions, IAU 258 (The Ages of Stars)


Astronomy research at UR: My primary research interests are the formation and evolution of exoplanets and stars in our Galactic neighborhood. My recent and on-going research projects and collaborations involve quantifying and trying to understand the evolution of protoplanetary and dusty debris disks around normal stars, improving distance and age estimates to astrophysically interesting stellar, protostellar, substellar, and planetary systems, and surveys to image extrasolar planets and substellar companions to nearby stars in the near- and thermal infrared. I also recently discovered a few new nearby young stellar groups in the solar neighborhood within a few hundred parsecs of the Sun, and I am interested in investigating the recent star-formation history and kinematics of the solar neighborhood and what it can inform us about star-formation mechanisms. UR faculty in the Physics & Astronomy (PAS) department and Earth and Environmental Sciences (EES) department are also collaborating on planetary science research. I am collaborating with UR professor John Tarduno on constraining the interaction between the Earth's magnetic dynamo and the early Sun (during the first billion years). With UR professor Alice Quillen, our groups have been recently working on trying to discover circumplanetary "moon-forming" disks and extrasolar ring systems like J1407 which may show the signatures of exomoons dynamically sculpting the disk.

Service: I am currently the undergraduate adviser for Physics & Astronomy majors at UR, and member of the department's undergraduate advising and curriculum committee, and strategic planning committees. I was awarded the Excellence in Undergraduate Teaching Award in 2012. During 2011-2012, I was telescope scientist for the Blanco 4-meter telescope at Cerro Tololo Inter-American Observatory in Chile, where I helped manage the f/8 mirror recovery effort and assisted with the installation of the Dark Energy Camera (DECam). I currently run an active research group at University of Rochester involving students and postdocs.

Recent Publications

  • "Detecting the Oldest Geodynamo and Attendant Shielding from the Solar Wind: Implications for Habitability"
    Tarduno, Blackman, & Mamajek (2014, Physics of the Earth and Planetary Interiors, in press) | Supplementary Content on reconstruction of the past Sun | Table of parameters for the past Sun at different geological epochs: effective temperature, spectral type, luminosity, radius, X-ray luminosity, coronal temperature, mass-loss rate, magnetosphere stand-off radius

  • "Analysis of 1SWASP J140747.93-394542.6 eclipse fine-structure: hints of exomoons"
    van Werkhoven, Kenworthy, & Mamajek (2014, MNRAS, 441, 2845) | paper | Fig. 6 zoom-in of light curve

  • "HD 106906 b: A Planetary-Mass Companion Outside a Massive Debris Disks"
    Bailey, Meshkat, Reiter, Morzinski, Males, Su, Hinz, Kenworthy, Stark, Mamajek, Briguglio, Close, Follette, Puglisi, Rodigas, Weinberger, Xompero (2014, ApJ Letters, in press; arxiv:/1312.1265) | Figure of separation vs. mass for known exoplanet candidates showing HD 106906b

  • "Ages of Young Stars"
    Soderblom, Hillenbrand, Jeffries, Mamajek, & Naylor (2014, review chapter for "Protostars & Planets VI", in press; arXiv:1311.7024)

  • "The Solar Neighborhood XXX. Fomalhaut C"
    Mamajek, Bartlett, Seifahrt, Henry, Dieterich, Lurie, Kenworthy, Jao, Riedel, Subasavage, Winters, Finch, Ianna, & Bean (2013, AJ, 146, 154)

  • "The Kappa Andromedae System: New Constraints on the Companion Mass, System Age & Further Multiplicity"
    Hinkley et al. (2014, ApJ, in press; arxiv:1309.3372)

  • "Intrinsic Colors, Temperatures, and Bolometric Corrections of Pre-Main Sequence Stars"
    Pecaut & Mamajek (2013, ApJS, 208, 9) Tables Queryable in Vizier

  • "A Kine-Chemical Investigation of the AB Dor Moving Group 'Stream'"
    Barenfeld, Bubar, Mamajek, & Young (2013, ApJ, 766, 6)

  • "Planetary Construction Zones in Occultation: Discovery of an Extrasolar Ring System Transiting a Young Sun-like Star and Future Prospects for Detecting Eclipses by Circumsecondary and Circumplanetary Disks"
    Mamajek, Quillen, Pecaut, Moolekamp, Scott, Kenworthy, Collier Cameron, & Parley (2012, AJ, 143, 72): How can we find and constrain the origins of extrasolar moons? The disks they form from can eclipse stars!

  • "On the Age and Binarity of Fomalhaut"
    Mamajek (2012, ApJ, 754, L20): The famous debris disk and exoplanet host star Fomalhaut is twice as old as previously thought: ~440 million years old.

  • "A Revised Age for Upper Scorpius and the Star Formation History among the F-type Members of the Scorpius-Centaurus OB Association"
    Pecaut, Mamajek, & Bubar (2012, ApJ, 746, 154)

    Selected Publications

  • "Discovery of a Faint Companion to Alcor Using MMT/AO 5 um Imaging"
    Mamajek, Kenworthy, Hinz, & Meyer (2010, AJ, 139, 919)

  • "Initial Conditions of Planet Formation: Lifetimes of Primordial Disks"
    Mamajek (2009, AIPC, 1158, 3)

  • "Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics"
    Mamajek & Hillenbrand (2008, ApJ, 687, 1264)

  • "On the distance to the Ophiuchus star-forming region"
    Mamajek (2008, AN, 329, 10)

  • "An Improbable Solution to the Underluminosity of 2M1207B: A Hot Protoplanet Collision Afterglow"
    Mamajek & Meyer (2007, ApJ, 668, L175)

  • "A Moving Cluster Distance to the Exoplanet 2M1207b in the TW Hydrae Association"
    Mamajek (2005, ApJ, 634, 1385)

  • "Constraining the Lifetime of Circumstellar Disks in the Terrestrial Planet Zone: A Mid-Infrared Survey of the 30 Myr old Tucana-Horologium Association"
    Mamajek, Meyer, Hinz, et al. (2004, ApJ, 612, 496)

  • "Post-T Tauri Stars in the Nearest OB Association"
    Mamajek, Meyer, & Liebert (2002, AJ, 124, 1670)

  • "The Dispersal of Young Stars and the Greater Sco-Cen Association"
    Mamajek & Feigelson (2001, ASPC, 244, 104)

  • "The Eta Chamaeleontis Cluster: Origin in the Sco-Cen OB Association"
    Mamajek, Lawson, & Feigelson (2000, ApJ, 544, 356)

  • "The Eta Chamaeleontis Cluster: A Remarkable New Nearby Young Open Cluster"
    Mamajek, Lawson, & Feigelson (1999, ApJ, 516, L77)

    Current student and postdoctoral collaborators affiliated with UR

  • Erin Scott: UR PhD student
  • Fred Moolekamp: UR PhD student
  • Manuel Olmedo: INAOE PhD student visiting UR

  • Molly Finn: UR class of 2016 (2013 REU program - 2013)
  • Jonathan Strumpf: UR class of 2015 (UR REU program - 2013)
  • Tanveer Karim: UR class of 2016
  • Dave Cameron: UR

    Past students and postdoc collaborators

  • Susana Acosta: UR class of 2012
  • Scott Barenfeld: UR class of 2012 (now PhD student in Astronomy - Caltech; 2014 NSF Graduate Student Fellow)
  • Matt Bourque: class of 2011 (Florida Tech) (2010 UR REU program)
  • Eric Bubar: postdoc (PhD 2009 Clemson; now assistant professor Physics - Marymount University)
  • Julieta Gruszko: UR class of 2012 (now PhD student in Physics - University of Washington; 2014 NSF Graduate Student Fellow)
  • Dilyana Mihaylova: UR class of 2013
  • Duy Cuong Nguyen: postdoc (PhD 2009 U. Toronto; now Research Associate - Univ. Toronto)
  • Mark Pecaut: UR PhD class of 2013 (now Assistant Professor - Rockhurst University)
  • Andrew Roberts: SUNY-Geneseo class of 2015 (UR REU program - 2013)
  • Alex Shvonski: UR MSc class of 2009 (now PhD student in Physics - Boston College)
  • Marek Slipski: UR class of 2011 (now PhD student in Astrophysical and Planetary Sciences - Univ. of Colorado, Boulder)
  • Fan Wu: UR class of 2014