Seppo Mattila profiilikuva
professori, Tuorlan observatorio


+358 29 450 4518
+358 50 412 5859
Vesilinnantie 5


I received my PhD degree from Imperial College, Univ. of London in 2002. After this I held postdoctoral positions at Stockholm University, Helsinki University of Technology (now Aalto University) and Queen's University Belfast. I moved back to Finland in 2007 with an Academy of Finland Research Fellowship to work at Tuorla Observatory at University of Turku. Between 2012 and 2015 I worked at the Finnish Centre for Astronomy with ESO (FINCA) as a University Researcher. I was appointed as a Professor of Astronomy at the Department of Physics and Astronomy at University of Turku in 2015. After 2010 I have made extended research visits to Stockholm University (18 months) and to University of Cambridge, UK (10 months). I have been the Finnish delegate in the European Southern Observatory (ESO) Council since 2020 and in the International Scientific Committee (CCI) of the Roque de los Muchachos and Teide observatories since 2019. Since 2022 I have also served as the President of the CCI. I am currently also a member of the Nordic Optical Telescope (NOT) Council and the board of FINCA and a vice member of the board of the Univ. of Turku Faculty of Science. In 2022 I was invited as a member of the Finnish Academy of Science and Letters.


I have taught several courses in astronomy, astrophysics and signal and image processing at the Univ. of Turku. In  particular, I initiated two new observational astronomy courses currently offered at national level for students from Turku, Helsinki, Oulu and the Aalto University. These courses offer hands-on experience on the use of the Nordic Optical Telescope (NOT) remotely from Univ. of Turku (Observational Techniques Using the Nordic Optical Telescope) and on the science exploitation of data from the European Southern Observatory (ESO; Data Processing Techniques for Astronomy with ESO Instrumentation). Currently I teach also the BSc course on observational astronomy and the MSc courses Spectroscopic Diagnostics in Astrophysics and Signal and Image Processing. In my teaching I always try to make use of examples from the latest research in order to offer a motivating learning experience for the students.


​​My main research interests focus on observational work on extragalactic astrophysical transients, including supernovae, tidal disruption events, and kilonovae. For more details on my research and information on the research group please see For a complete list of my refereed journal papers see ADS (in chronological order) or ADS (ordered by number of citations).

Selected recent papers:

Kool et al. (incl. Mattila) 2023, Nature: A radio-detected type Ia supernova with helium-rich circumstellar material

Pasham et al. (incl. Mattila) 2022, Nature Astronomy: The Birth of a Relativistic Jet Following the Disruption of a Star by a Cosmological Black Hole

Reynolds, Mattila et al. 2022, A&A: Energetic nuclear transients in luminous and ultraluminous infrared galaxies

Perez-Torres, Mattila et al. 2021, The Astronomy and Astrophysics Review: Star formation and nuclear activity in luminous infrared galaxies: An infrared through radio review

Kool, Reynolds, Mattila et al. 2020, MNRAS: AT2017gbl: a dust obscured TDE candidate in a luminous infrared galaxy

Ackley et al. (incl. Mattila) 2020, A&A: Observational constraints on the optical and near-infrared emission from the neutron star-black hole binary merger S190814bv

Reynolds, Fraser, Mattila et al. 2020, MNRAS: SN 2016gsd: An unusually luminous and linear type II supernova with high velocities

Mattila et al. 2018, Science: A dust-enshrouded tidal disruption event with a resolved radio jet in a galaxy merger​

Smartt et al. (incl. Mattila) 2017, Nature: A kilonova as the electromagnetic counterpart to a gravitational-wave source​

Abbott et al. (imcl. Mattila) 2017, ApJ: Multi-messenger Observations of a Binary Neutron Star Merger

Kankare, Kotak, Mattila et al. 2017, Nature Astronomy: A population of highly energetic transient events in the centres of active galaxies

Kangas, Blagorodnova, Mattila et al. 2017, MNRAS: Gaia 16apd - a link between fast- and slowly-declining superluminous supernovae

Kangas, Portinari, Mattila et al. 2017, A&A: Core-collapse supernova progenitor constraints using the spatial distribution of massive stars in local galaxies



A Linear Relation between the Color Stretch sBV and the Rising Color Slope s0*(B−V) of Type Ia Supernovae (2023)

Astrophysical Journal
Chen P., Dong S., Ashall C., Benetti S., Bersier D., Bose S., Brimacombe J., Brink T.G., Buckley D.A.H., Cappellaro E., Christie G.W., Elias-Rosa N., Filippenko A.V., Gromadzki M., Holoien T.W.S., Hu S., Kochanek C.S., Koff R., Kollmeier J.A., Lundqvist P., Mattila S., Milne P.A., Muñoz J.A., Mutel R., Natusch T., Nicolas J., Pastorello A., Prentice S., Prieto J.L., Roth T., Shappee B.J., Stone G., Stanek K.Z., Stritzinger M.D., Thompson T.A., Tomasella L., Villanueva S.
(Vertaisarvioitu alkuperäisartikkeli tai data-artikkeli tieteellisessä aikakauslehdessä (A1))

Panning for gold, but finding helium: Discovery of the ultra-stripped supernova SN 2019wxt from gravitational-wave follow-up observations (2023)

Astronomy and Astrophysics
Agudo I, Amati L, An T, Bauer FE, Benetti S, Bernardini MG, Beswick R, Bhirombhakdi K, de Boer T, Branchesi M, Brennan SJ, Brocato E, Caballero-Garcia MD, Cappellaro E, Rodriguez NC, Castro-Tirado AJ, Chambers KC, Chassande-Mottin E, Chaty S, Chen TW, Coleiro A, Covino S, D'Ammando F, D'Avanzo P, D'Elia V, Fiore A, Flors A, Fraser M, Frey S, Frohmaier C, Fulton M, Galbany L, Gall C, Gao H, Garcia-Rojas J, Ghirlanda G, Giarratana S, Gillanders JH, Giroletti M, Gompertz BP, Gromadzki M, Heintz KE, Hjorth J, Hu YD, Huber ME, Inkenhaag A, Izzo L, Jin ZP, Jonker PG, Kann DA, Kool EC, Kotak R, Leloudas G, Levan AJ, Lin CC, Lyman JD, Magnier EA, Maguire K, Mandel I, Marcote B, Sanchez DM, Mattila S, Melandri A, Michalowski MJ, Moldon J, Nicholl M, Guelbenzu AN, Oates SR, Onori F, Orienti M, Paladino R, Paragi Z, Perez-Torres M, Pian E, Pignata G, Piranomonte S, Quirola-Vasquez J, Ragosta F, Rau A, Ronchini S, Rossi A, Sanchez-Ramirez R, Salafia OS, Schulze S, Smartt SJ, Smith KW, Sollerman J, Srivastav S, Starling RLC, Steeghs D, Stevance HF, Tanvir NR, Testa V, Torres MAP, Valeev A, Vergani SD, Vescovi D, Wainscost R, Watson D, Wiersema K, Wyrzykowski L, Yang J, Yang S, Young DR
(Vertaisarvioitu alkuperäisartikkeli tai data-artikkeli tieteellisessä aikakauslehdessä (A1))

A long life of excess: The interacting transient SN 2017hcc (2023)

Astronomy and Astrophysics
Moran S, Fraser M, Kotak R, Pastorello A, Benetti S, Brennan SJ, Gutierrez CP, Kankare E, Kuncarayakti H, Mattila S, Reynolds TM, Anderson JP, Brown PJ, Campana S, Chambers KC, Chen TW, Della Valle M, Dennefeld M, Elias-Rosa N, Galbany L, Galindo-Guil FJ, Gromadzki M, Hiramatsu D, Inserra C, Leloudas G, Muller-Bravo TE, Nicholl M, Reguitti A, Shahbandeh M, Smartt SJ, Tartaglia L, Young DR
(Vertaisarvioitu alkuperäisartikkeli tai data-artikkeli tieteellisessä aikakauslehdessä (A1))

SN 2017egm: A Helium-rich Superluminous Supernova with Multiple Bumps in the Light Curves (2023)

Astrophysical Journal
Zhu JZ, Jiang N, Dong SB, Filippenko AV, Rudy RJ, Pastorello A, Ashall C, Bose S, Post RS, Bersier D, Benetti S, Brink TG, Chen P, Dou LM, Elias-Rosa N, Lundqvist P, Mattila S, Russell RW, Sitko ML, Somero A, Stritzinger MD, Wang TG, Brown PJ, Cappellaro E, Fraser M, Kankare E, Moran S, Prentice S, Pursimo T, Reynolds TM, Zheng WK
(Vertaisarvioitu alkuperäisartikkeli tai data-artikkeli tieteellisessä aikakauslehdessä (A1))

A radio-detected type Ia supernova with helium-rich circumstellar material (2023)

Kool E.C., Johansson J., Sollerman J., Moldón J., Moriya T.J., Mattila S., Schulze S., Chomiuk L., Pérez-Torres M., Harris C., Lundqvist P., Graham M., Yang S., Perley D.A., Strotjohann N.L., Fremling C., Gal-Yam A., Lezmy J., Maguire K., Omand C., Smith M., Andreoni I., Bellm E.C., Bloom J.S., De K., Groom S.L., Kasliwal M.M., Masci F.J., Medford M.S., Park S., Purdum J., Reynolds T.M., Riddle R., Robert E., Ryder S.D., Sharma Y., Stern D.
(Vertaisarvioitu alkuperäisartikkeli tai data-artikkeli tieteellisessä aikakauslehdessä (A1))

Broad-emission-line dominated hydrogen-rich luminous supernovae (2023)

Monthly Notices of the Royal Astronomical Society
Pessi PJ, Anderson JP, Folatelli G, Dessart L, Gonzalez-Gaitan S, Moller A, Gutierrez CP, Mattila S, Reynolds TM, Charalampopoulos P, Filippenko AV, Galbany L, Gal-Yam A, Gromadzki M, Hiramatsu D, Howell DA, Inserra C, Kankare E, Lunnan R, Martinez L, McCully C, Meza N, Muller-Bravo TE, Nicholl M, Pellegrino C, Pignata G, Sollerman J, Tucker BE, Wang X, Young DR
(Vertaisarvioitu alkuperäisartikkeli tai data-artikkeli tieteellisessä aikakauslehdessä (A1))

The broad-lined Type-Ic supernova SN 2022xxf and its extraordinary two-humped light curves: I. Signatures of H/He-free interaction in the first four months (2023)

Astronomy and Astrophysics
Kuncarayakti H., Sollerman J., Izzo L., Maeda K., Yang S., Schulze S., Angus C.R., Aubert M., Auchettl K., Della Valle M., Dessart L., Hinds K., Kankare E., Kawabata M., Lundqvist P., Nakaoka T., Perley D., Raimundo S.I., Strotjohann N.L., Taguchi K., Cai Y.Z., Charalampopoulos P., Fang Q., Fraser M., Gutiérrez C.P., Imazawa R., Kangas T., Kawabata K.S., Kotak R., Kravtsov T., Matilainen K., Mattila S., Moran S., Murata I., Salmaso I., Anderson J.P., Ashall C., Bellm E.C., Benetti S., Chambers K.C., Chen T.W., Coughlin M., De Colle F., Fremling C., Galbany L., Gal-Yam A., Gromadzki M., Groom S.L., Hajela A., Inserra C., Kasliwal M.M., Mahabal A.A., Martin-Carrillo A., Moore T., Müller-Bravo T.E., Nicholl M., Ragosta F., Riddle R.L., Sharma Y., Srivastav S., Stritzinger M.D., Wold A., Young D.R.
(Vertaisarvioitu alkuperäisartikkeli tai data-artikkeli tieteellisessä aikakauslehdessä (A1))

Self-supervised clustering on image-subtracted data with deep-embedded self-organizing map (2023)

Monthly Notices of the Royal Astronomical Society
Mong Y-L, Ackley K, Killestein T L, Galloway D K, Vassallo C, Dyer M, Cutter R, Brown M J I, Lyman J, Ulaczyk K, Steeghs D, Dhillon V, O’Brien P, Ramsay G, Noysena K, Kotak R, Breton R, Nuttall L, Pallé E, Pollacco D, Thrane E, Awiphan S, Burhanudin U, Chote P, Chrimes A, Daw E, Duffy C, Eyles-Ferris R, Gompertz B P, Heikkilä T, Irawati P, Kennedy M, Levan A, Littlefair S, Makrygianni L, Marsh T, Mata Sánchez D, Mattila S, Maund J R, McCormac J, Mkrtichian D, Mullaney J, Rol E, Sawangwit U, Stanway E, Starling R, Strøm P, Tooke S, Wiersema K
(Vertaisarvioitu alkuperäisartikkeli tai data-artikkeli tieteellisessä aikakauslehdessä (A1))