For best experience please turn on javascript and use a modern browser!
You are using a browser that is no longer supported by Microsoft. Please upgrade your browser. The site may not present itself correctly if you continue browsing.

Dr. G.K. (Gudmundur) Stefansson

Assistant Professor
Faculty of Science
Anton Pannekoek Institute of Astronomy

Visiting address
  • Science Park 904
  • Room number: C4.115
Postal address
  • Postbus 94249
    1090 GE Amsterdam
Social media
  • Publications

    2024

    • Beard, C., Robertson, P., Giovinazzi, M. R., Murphy, J. M. A., Ford, E. B., Halverson, S., Han, T., Holcomb, R., Lubin, J., Luque, R., Premnath, P., Bender, C. F., Blake, C. H., Gong, Q., Isaacson, H., Kanodia, S., Li, D., Lin, A. S. J., Logsdon, S. E., ... Wright, J. T. (2024). Utilizing Photometry from Multiple Sources to Mitigate Stellar Variability in Precise Radial Velocities: A Case Study of Kepler-21. Astronomical Journal, 168(4), Article 149. https://doi.org/10.3847/1538-3881/ad6b22
    • Bernabò, L. M., Kanodia, S., Cañas, C. I., Cochran, W. D., Csizmadia, S., Mahadevan, S., Stefánsson, G., Gupta, A. F., Monson, A., Kobulnicky, H. A., Larsen, A. K., Cotter, E. G., Birkholz, A., Swaby, T. N., Zeimann, G., Bender, C. F., Diddams, S. A., Libby-Roberts, J. E., Lin, A. S. J., ... Schwab, C. (2024). Searching for GEMS: TOI-6383Ab, a Giant Planet Transiting an M3-dwarf Star in a Binary System. Astronomical Journal, 168(6), Article 273. https://doi.org/10.3847/1538-3881/ad7fe8 [details]
    • Brady, M., Bean, J. L., Seifahrt, A., Kasper, D., Luque, R., Stefánsson, G., Stürmer, J., Charbonneau, D., Collins, K. A., Doty, J. P., Essack, Z., Fukui, A., Horta, F. G., Hedges, C., Hellier, C., Jenkins, J. M., Narita, N., Quinn, S. N., Shporer, A., ... Zambelli, R. (2024). Early Results from the HUMDRUM Survey: A Small, Earth-mass Planet Orbits TOI-1450A. Astronomical Journal, 168(2), Article 67. https://doi.org/10.3847/1538-3881/ad500a
    • Dai, F., Howard, A. W., Halverson, S., Orell-Miquel, J., Pallé, E., Isaacson, H., Fulton, B., Price, E. M., Plotnykov, M., Rogers, L. A., Valencia, D., Paragas, K., Greklek-McKeon, M., Gomez Barrientos, J., Knutson, H. A., Petigura, E. A., Weiss, L. M., Lee, R., Brinkman, C. L., ... Vanderspek, R. (2024). An Earth-sized Planet on the Verge of Tidal Disruption. Astronomical Journal, 168(3), Article 101. https://doi.org/10.3847/1538-3881/ad5a7d
    • Espinoza-Retamal, J. I., Stefánsson, G., Petrovich, C., Brahm, R., Jordán, A., Sedaghati, E., Lucero, J. P., Pinto, M. T., Muñoz, D. J., Boyle, G., Leiva, R., & Suc, V. (2024). HATS-38 b and WASP-139 b Join a Growing Group of Hot Neptunes on Polar Orbits. Astronomical Journal, 168(4), Article 185. https://doi.org/10.3847/1538-3881/ad70b8
    • Fitzmaurice, E., Stefánsson, G., Kavanagh, R. D., Mahadevan, S., Cañas, C. I., Winn, J. N., Robertson, P., Ninan, J. P., Albrecht, S., Callingham, J. R., Cochran, W. D., Delamer, M., Ford, E. B., Kanodia, S., Lin, A. S. J., Marcussen, M. L., Pope, B. J. S., Ramsey, L. W., Roy, A., ... Wright, J. T. (2024). Astrometry and Precise Radial Velocities Yield a Complete Orbital Solution for the Nearby Eccentric Brown Dwarf LHS 1610 b. Astronomical Journal, 168(3), Article 140. https://doi.org/10.3847/1538-3881/ad57be
    • Gan, T., Wang, S. X., Dai, F., Winn, J. N., Mao, S., Xu, S., Pallé, E., Bean, J. L., Brady, M., Brown, N., Lu, C., Luque, R., Mocnik, T., Seifahrt, A., & Stefánsson, G. K. (2024). The Aligned Orbit of a Hot Jupiter around the M Dwarf TOI-4201. Astrophysical Journal Letters, 969(1), Article L24. https://doi.org/10.3847/2041-8213/ad5967
    • Giacalone, S., Dai, F., Zanazzi, J. J., Howard, A. W., Dressing, C. D., Winn, J. N., Rubenzahl, R. A., Carmichael, T. W., Vowell, N., Kesseli, A., Halverson, S., Isaacson, H., Brodheim, M., Deich, W., Fulton, B. J., Gibson, S. R., Hill, G. M., Holden, B., Householder, A., ... Yeh, S. (2024). The OATMEAL Survey. I. Low Stellar Obliquity in the Transiting Brown Dwarf System GPX-1. Astronomical Journal, 168(5), Article 189. https://doi.org/10.3847/1538-3881/ad785a
    • Gupta, A. F., Millholland, S. C., Im, H., Dong, J., Jackson, J. M., Carleo, I., Libby-Roberts, J., Delamer, M., Giovinazzi, M. R., Lin, A. S. J., Kanodia, S., Wang, X. Y., Stassun, K., Masseron, T., Dragomir, D., Mahadevan, S., Wright, J., Alvarado-Montes, J. A., Bender, C., ... Ziegler, C. (2024). A hot-Jupiter progenitor on a super-eccentric retrograde orbit. Nature, 632(8023), 50-54. https://doi.org/10.1038/s41586-024-07688-3
    • Hon, M., Stefánsson, G., & Keck Planet Finder (2024). Asteroseismology of the Nearby K Dwarf σ Draconis Using the Keck Planet Finder and TESS. Astrophysical Journal, 975(1), Article 147. https://doi.org/10.3847/1538-4357/ad76a9 [details]
    • Jones, S. E., Stefánsson, G., Masuda, K., Libby-Roberts, J. E., Gardner, C. N., Holcomb, R., Beard, C., Robertson, P., Cañas, C. I., Mahadevan, S., Kanodia, S., Lin, A. S. J., Kobulnicky, H. A., Parker, B. A., Bender, C. F., Cochran, W. D., Diddams, S. A., Fernandes, R. B., Gupta, A. F., ... Wisniewski, J. (2024). TOI-2015 b: A Warm Neptune with Transit Timing Variations Orbiting an Active Mid-type M Dwarf. Astronomical Journal, 168(2), Article 93. https://doi.org/10.3847/1538-3881/ad55ea
    • Kanodia, S., Gupta, A. F., Cañas, C. I., Bernabò, L. M., Reji, V., Han, T., Brady, M., Seifahrt, A., Cochran, W. D., Morrell, N., Basant, R., Bean, J., Bender, C. F., de Beurs, Z. L., Bieryla, A., Birkholz, A., Brown, N., Chapman, F., Ciardi, D. R., ... Vanderburg, A. (2024). Searching for GEMS: Characterizing Six Giant Planets Around Cool Dwarfs. Astronomical Journal, 168(6), Article 235. https://doi.org/10.3847/1538-3881/ad7796 [details]
    • Lubin, J., Petigura, E. A., Van Zandt, J., Beard, C., Dai, F., Halverson, S., Holcomb, R., Howard, A. W., Isaacson, H., Luhn, J., Robertson, P., Rubenzahl, R. A., Stefánsson, G., Winn, J. N., Brodheim, M., Deich, W., Hill, G. M., Gibson, S. R., Holden, B., ... Walawender, J. (2024). The HD 191939 Exoplanet System is Well Aligned and Flat. Astronomical Journal, 168(5), Article 196. https://doi.org/10.3847/1538-3881/ad79ed
    • Martioli, E., Petrucci, R. P., Jofré, E., Hébrard, G., Ghezzi, L., Gómez Maqueo Chew, Y., Díaz, R. F., Perottoni, H. D., Garcia, L. H., Rapetti, D., Lecavelier Des Etangs, A., De Almeida, L., Arnold, L., Artigau, E., Basant, R., Bean, J. L., Bieryla, A., Boisse, I., Bonfils, X., ... Twicken, J. D. (2024). TOI-3568 b: A super-Neptune in the sub-Jovian desert. Astronomy and Astrophysics, 690, Article A312. https://doi.org/10.1051/0004-6361/202450334
    • Rubenzahl, R. A., Dai, F., Halverson, S., Howard, A. W., Householder, A., Fulton, B., Behmard, A., Gibson, S. R., Roy, A., Shaum, A. P., Isaacson, H., Brodheim, M., Deich, W., Hill, G. M., Holden, B., Laher, R. R., Lanclos, K., Payne, J. N., Petigura, E. A., ... Wishnow, E. (2024). KPF Confirms a Polar Orbit for KELT-18 b. Astronomical Journal, 168(5), Article 188. https://doi.org/10.3847/1538-3881/ad70b5 [details]
    • Rubenzahl, R. A., Howard, A. W., Halverson, S., Petrovich, C., Angelo, I., Stefánsson, G., Dai, F., Householder, A., Fulton, B., Gibson, S. R., Roy, A., Shaum, A. P., Isaacson, H., Brodheim, M., Deich, W., Hill, G. M., Holden, B., Huber, D., Laher, R. R., ... Wright, J. T. (2024). Obliquity Constraints for the Extremely Eccentric Sub-Saturn Kepler-1656 b. Astrophysical Journal Letters, 971(2), Article L40. https://doi.org/10.3847/2041-8213/ad6985
    • Saunders, N., Grunblatt, S. K., Chontos, A., Dai, F., Huber, D., Zhang, J., Stefánsson, G., van Saders, J. L., Winn, J. N., Hey, D., Howard, A. W., Fulton, B., Isaacson, H., Beard, C., Giacalone, S., Van Zandt, J., Murphey, J. M. A., Rice, M., Blunt, S., ... Yeh, S. (2024). TESS Giants Transiting Giants. VI. Newly Discovered Hot Jupiters Provide Evidence for Efficient Obliquity Damping after the Main Sequence. Astronomical Journal, 168(2), Article 81. https://doi.org/10.3847/1538-3881/ad543b
    • Siegel, J. C., Halverson, S., Luhn, J. K., Zhao, L. L., Al Moulla, K., Robertson, P., Bender, C. F., Terrien, R. C., Roy, A., Mahadevan, S., Hearty, F., Ninan, J. P., Wright, J. T., Ford, E. B., Schwab, C., Stefánsson, G., Blake, C. H., & McElwain, M. W. (2024). Quiet Please: Detrending Radial Velocity Variations from Stellar Activity with a Physically Motivated Spot Model. Astronomical Journal, 168(4), Article 158. https://doi.org/10.3847/1538-3881/ad6768

    2023

    • Morley, C., Gully-Santiago, M., MacLeod, M., Oklopcic, A., Luna, J., Tran, Q. H., Ninan, J. P., Mahadevan, S., Krolikowski, D. M., Cochran, W. D., Bowler, B. P., Endl, M., Stefansson, G., Tofflemire, B. M., Vanderburg, A. & Zeimann, G. R. (23-4-2023). Giant Tidal Tails of Helium Escaping the Hot Jupiter HAT-P-32 b. Zenodo. https://doi.org/10.5281/zenodo.7767042
    This list of publications is extracted from the UvA-Current Research Information System. Questions? Ask the library or the Pure staff of your faculty / institute. Log in to Pure to edit your publications. Log in to Personal Page Publication Selection tool to manage the visibility of your publications on this list.
  • Ancillary activities
    No ancillary activities