Mayuko Mori / 森 万由子
Mayuko Mori / 森 万由子
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JSPS Postdoctoral Research Fellow (PD)
Affiliation
Astrobiology Center, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
Email mayukomori.519_at_gmail.com
(Please replace "_at_" with "@".)
Twitter @asnaronomer / ENG: @asnaronomer_en
YouTube Asnaro Science
CV (updated: 2025 April)
I am studying exoplanets, which are planets orbiting stars other than the Sun.
My focus is on planets that are larger than Earth and smaller than Neptune, which are so-called "Super-Earths" or "Sub-Neptunes." What kind of atmosphere do they have? Do they have oceans? And what do they look like? Observational studies of these planets, which do not exist in our Solar System, are important to understand how planets have formed and evolved in the Universe.
To reveal the nature of the sub-Neptunes, I am conducting multi-band transit photometry and spectroscopy mostly using ground-based telescopes, such as the MuSCAT series operated by our team.
Recently, I have been focusing on the effects of starspots on the transit spectroscopy of planetary atmospheres and am conducting multi-band monitoring observations of stellar brightness variability to constrain the stellar surface and assess its effect on transit observations. I am also strongly interested in transmission spectroscopy using space telescopes and statistical methods for time-series analysis.
Outside the office, I like science communication and creating videos. As an outreach activity, I upload YouTube videos about astronomy and my life as a researcher.
Education and Academic Career
Education and Academic Career
2024 - current JSPS postdoctoral research fellow, Astrobiology Center
Lecturer (part-time), Kanagawa University
2023 - 2024 Project Researcher, Department of Multi-Disciplinary Sciences,
Graduate School of Arts and Sciences, The University of Tokyo
2020 - 2023 Dr.Sc. (similar to Ph.D.), Department of Astronomy,
Graduate School of Science, The University of Tokyo
Thesis: Characterization of Exoplanetary Systems Around M-dwarfs and Their Stellar Activities
2018 - 2020 M.Sc., Department of Astronomy, Graduate School of Science, The University of Tokyo
Thesis: Transmission Spectroscopy of the Atmosphere of TRAPPIST-1g using Subaru/MOIRCS and Gemini/GMOS-N.
2014 - 2018 B.Sc., Department of Astronomy, School of Science, The University of Tokyo
Grants and Funding
Grants and Funding
2024 - 2027 JSPS KAKENHI (Grant-in-Aid for Early-Career Scientists)
Japan Society for the Promotion of Science (JSPS), Grant Number JP24K17083
2024 - 2027 JSPS Research Fellowship / Grant-in-Aid for Young Scientists (PD)
Japan Society for the Promotion of Science (JSPS), Grant Number JP24KJ0241
2020 - 2023 JSPS Research Fellowship / Grant-in-Aid for Young Scientists (DC1)
Japan Society for the Promotion of Science (JSPS), Grant Number JP20J21872
2019 - 2023 Research Assistant under International Graduate Program for
Excellence in Earth-Space Science (IGPEES), University of Tokyo
Outreach Activities
Outreach Activities
Running YouTube channel "Asnaro Science"
Organizing science-cafe events "Space Cafe Tokyo"
A former co-organizer of an academic community "Astrobiology Club"
A former staff of NAOJ Mitaka Stargazing Party etc...
Presentations
Presentations
Talks
Talks
Transmission Spectroscopy of the Atmosphere of TRAPPIST-1g using Subaru/MOIRCS and Gemini/GMOS-N
Subaru Telescope 20th Anniversary The 5th NAOJ Symposium / The 7th Subaru Scientific Meeting, Waikoloa Beach Marriott Resort & Spa, The Big Island of Hawaii, November 2019Characterization of Exoplanets by the Synergy of SWIMS and MuSCAT3
SWIMS-on-Subaru Workshop, online, July 2020The Stellar Surface Effects on Transmission Spectroscopy: The importance of simultaneous observation in a wide wavelength range
Ariel Virtual Consortium Meeting, online, February 2021Effective multi-colour monitoring observations to assess the starspots’ effect on planetary transits
Ariel Consortium Meeting, Mercure Budapest Castle Hill, Hungary, October 2023Multi-band starspot characterization by synergy of TESS and ground-based telescopes
TESS Science Conference III, MIT, USA, August 2024
Understanding Starspots: The Nature and Impact on Atmosphere Observations of Young Exoplanets (Invited)
Young Transiting Planet Workshop 2025, Fusaki Beach Resort, Japan, March 2025
+19 talks in domestic conferences / meetings
Posters
Posters
An Astronomy Student became a YouTuber!?: YouTube is an effective tool for astronomy communication
Communicating Astronomy with the Public 2018, Fukuoka Science Museum, Japan, March 2018Light-curve Analyses on TRAPPIST-1 d & e for Mass Estimation
Sagan Exoplanet Workshop 2018, California Science Institute in Technology, USA, July 2018TESS Follow-up Observation with IRSF/SIRIUS
The 3rd Advanced School on Exoplanetary Science, Lloyd's Baia Hotel, Italy, May 2019Ground-based Transmission Spectroscopy of the Atmosphere of TRAPPIST-1g
TRAPPIST-1 conference, University of Liège, Belgium, June 2019Ground-based Transmission Spectroscopy of the Atmosphere of TRAPPIST-1g
Planet2 / RESCEU Symposium 2019, Bankoku Shinryokan, Japan, October 2019Ground-based Transmission Spectroscopy of TRAPPIST-1g
JpGU-AGU Joint Meeting 2020, online, July 2020A warm Sub-Neptune transiting the M3 dwarf TOI 1696
TESS Science Conference II, online, August 2021Ground-based multi-color observations of a young mid-M dwarf K2-25 to assess the effect of stellar activities on planetary transits
Cool Stars 21, The Pierre Baudis Convention Centre, France, July 2022Effectiveness of multi-band simultaneous monitoring for starspot characterization on cool dwarfs
Cool Stars 22, UCSD, USA, June 2024
+3 posters in domestic conferences / meetings
Research Publications
Research Publications
MuSCAT2: 4-color Simultaneous Camera for the 1.52m Telescopio Carlos Sanchez
Narita, N. et al., 2019, Journal of Astronomical Telescopes, Instruments, and Systems, Volume 5, id. 015001Multicolour photometry for exoplanet candidate validation
Parviainen, H. et al., 2019, Astronomy & Astrophysics, Volume 630, id. A89Near-resonance in a system of sub-Neptunes from TESS
Quinn, S. N. et al., 2019, The Astronomical Journal, Volume 158, Issue 5, id. 177Kojima-1Lb Is a Mildly Cold Neptune around the Brightest Microlensing Host Star
Fukui, A. et al., 2019, The Astronomical Journal, Volume 158, Issue 5, id. 206MuSCAT2 multicolour validation of TESS candidates: an ultra-short-period substellar object around an M dwarf
Parviainen, H. et al., 2020, Astronomy & Astrophysics, Volume 633, id. A28An ultrahot Neptune in the Neptune desert
Jenkins, J. S. et al., 2020, Nature Astronomy, Volume 4, p. 1148-1157Three Short Period Jupiters from TESS. HIP 65Ab, TOI-157b and TOI-169b
Nielsen, L. D. et al., 2020, Astronomy & Astrophysics, Volume 639, id. A76Obliquity measurement and atmospheric characterization of the WASP-74 planetary system
Luque, R. et al., 2020, Astronomy & Astrophysics, Volume 642, id. A50The CARMENES search for exoplanets around M dwarfs: Two planets on the opposite sides of the radius gap transiting the nearby M dwarf LTT3780
Nowak, G. et al., 2020, Astronomy & Astrophysics, Volume 642, id. A173Discovery of a hot, transiting, Earth-sized planet and a second temperate, non-transiting planet around the M4 dwarf GJ 3473 (TOI-488)
Kemmer, J., et al., 2020, Astronomy & Astrophysics, Volume 642, id. A236TOI-519 b: a short-period substellar object around an M dwarf validated using multicolour photometry and phase curve analysis
Parviainen, H. et al., 2021, Astronomy & Astrophysics, Volume 645, id. A16Hubble WFC3 Spectroscopy of the Habitable-zone Super-Earth LHS 1140 b
Edwards, B. et al., 2021, The Astronomical Journal, Volume 161, Issue 1, id.44An enhanced slope in the transmission spectrum of the hot Jupiter WASP-104b
Chen, G. et al., 2021, Monthly Notices of the Royal Astronomical Society, Volume 500, Issue 4, pp.5420-5435Mass and density of the transiting hot and rocky super-Earth LHS 1478 b (TOI-1640 b)
Soto, M. G. et al., 2021, Astronomy & Astrophysics, Volume 649, id. A144Two Bright M Dwarfs Hosting Ultra-Short Period Super-Earths with Earth-like Compositions
Hirano, T. et al., 2021, The Astronomical Journal, Volume 162, Issue 4, id. 161
TOI-1749: A Trio of Planets around an M dwarf including a Planetary Pair Very Close to 2:1 Period Ratio
Fukui, A. et al., 2021, The Astronomical Journal, Volume 162, Issue 4, id. 167
The Magellan-TESS Survey I: Survey Description and Mid-Survey Results
Taske, J. et al., 2021, The Astrophysical Journal Supplement Series, Volume 256, Issue 2, id. 33TESS-Keck Survey. V. Twin Sub-Neptunes Transiting the Nearby G Star HD 63935
Scarsdale, N. et al., 2021, The Astronomical Journal, Volume 162, Issue 5, id. 215
Is the orbit of the exoplanet WASP-43b really decaying? TESS and MuSCAT2 observations confirm no detection
Garai, Z. et al., 2021, Monthly Notices of the Royal Astronomical Society, Volume 508, Issue 4, pp.5514-5523Near-infrared transmission spectrum of TRAPPIST-1 h using Hubble WFC3 G141 observations
Gressier, A., Mori, M. et al., 2022, Astronomy & Astrophysics, Volume 658, id. A133
Validation of 13 Hot and Potentially Terrestrial TESS Planets
Giacalone, S. et al., 2022, The Astronomical Journal, Volume 163, Issue 2, id. 99
TOI-2285b: A 1.7 Earth-radius planet near the habitable zone around a nearby M dwarf
Fukui, A. et al., 2022, Publications of the Astronomical Society of Japan, Volume 74, Issue 1, pp.L1-L8
Nodal precession of WASP-33b for 11 yr by Doppler tomographic and transit photometric observations
Watanabe, N. et al., 2022, Monthly Notices of the Royal Astronomical Society, Volume 512, Issue 3, pp.4404-4418
A Possible Alignment Between the Orbits of Planetary Systems and their Visual Binary Companions
Christian, S. et al., 2022, The Astronomical Journal, Volume 163, Issue 5, id.207
TOI-1696: A Nearby M4 Dwarf with a 3 R⊕ Planet in the Neptunian Desert
Mori, M. et al., 2022, The Astronomical Journal, Volume 163, id. 298The TESS-Keck Survey. XIII. An Eccentric Hot Neptune with a Similar-Mass Outer Companion around TOI-1272
MacDougall, Mason G. et al., 2022, The Astronomical Journal, Volume 164, Issue 3, id.97
Validation and atmospheric exploration of the sub-Neptune TOI-2136b around a nearby M3 dwarf
Kawauchi, K. et al., 2022, Astronomy & Astrophysics, Volume 666, id.A4, 19 pp.A hot sub-Neptune in the desert and a temperate super-Earth around faint M dwarfs: Color validation of TOI-4479b and TOI-2081b
Esparza-Borges, E. et al., 2022, Astronomy & Astrophysics, Volume 666, id.A10, 13 pp.TOI-1468: A system of two transiting planets, a super-Earth and a mini-Neptune, on opposite sides of the radius valley
Chaturvedi, P. et al., 2022, Astronomy & Astrophysics, Volume 666, id.A155, 25 pp.
Two temperate super-Earths transiting a nearby late-type M dwarf
Delrez, L. et al., 2022, Astronomy & Astrophysics, Volume 667, id.A59, 31 pp.An Earth-sized Planet around an M5 Dwarf Star at 22 pc
Hirano, T. et al., 2023, The Astronomical Journal, Volume 165, Issue 3, id.131, 14 pp.TOI-1442 b and TOI-2445 b: Two potentially rocky ultra-short period planets around M dwarfs
Morello, G. et al., 2023, Astronomy & Astrophysics, Volume 673, id.A32, 18 pp.A temperate Earth-sized planet with tidal heating transiting an M6 star
Peterson, Merrin S. et al., 2023, Nature, Volume 617, Issue 7962, p.701-705A sub-Neptune transiting the young field star HD 18599 at 40 pc
de Leon, J. et al., 2023, Monthly Notices of the Royal Astronomical Society, Volume 522, Issue 1, pp.750-766Two sub-Neptunes around the M dwarf TOI-1470
González-Álvarez, E. et al., 2023, Astronomy & Astrophysics, Volume 675, id.A177, 21 pp.The mass of TOI-519 b: A close-in giant planet transiting a metal-rich mid-M dwarf
Kagetani, Taiki et al., 2023, Publications of the Astronomical Society of Japan, Volume 75, Issue 4, pp.713-721GJ 806 (TOI-4481): A bright nearby multi-planetary system with a transiting hot low-density super-Earth
Palle, E. et al., 2023, Astronomy & Astrophysics, Volume 678, id.A80, 28 pp.TOI 4201 b and TOI 5344 b: Discovery of Two Transiting Giant Planets around M-dwarf Stars and Revised Parameters for Three Others
Hartman, J. D. et al., 2023, The Astronomical Journal, Volume 166, Issue 4, id.163, 23 pp.An M dwarf accompanied by a close-in giant orbiter with SPECULOOS
Triaud, A. H. M. J. et al., 2023, Monthly Notices of the Royal Astronomical Society: Letters, Volume 525, Issue 1, pp.L98-L104A resonant sextuplet of sub-Neptunes transiting the bright star HD 110067
Luque, R. et al., 2023, Nature, Volume 623, Issue 7989, p.932-937TOI-1801 b: A temperate mini-Neptune around a young M0.5 dwarf
Mallorquín, M. et al., 2023, Astronomy & Astrophysics, Volume 680, id.A76, 26 pp.Simultaneous multicolour transit photometry of hot Jupiters HAT-P-19b, HAT-P-51b, HAT-P-55b, and HAT-P-65b
Kang, H. et al., 2024, Monthly Notices of the Royal Astronomical Society, Volume 528, Issue 2, pp.1930-1944TOI-2266 b: A keystone super-Earth at the edge of the M dwarf radius valley
Parviainen, H. et al., 2024, Astronomy & Astrophysics, Volume 683, id.A170, 13 pp.TOI-4438 b: a transiting mini-Neptune amenable to atmospheric characterization
Goffo, E. et al., 2024, Astronomy & Astrophysics, Volume 685, id.A147, 20 pp.
Characterization of starspots on a young M-dwarf K2-25: multi-band observations of stellar photometric variability and planetary transits
Mori, M. et al., 2024, Monthly Notices of the Royal Astronomical Society, Volume 530, Issue 1, pp.167–189Identification of the Top TESS Objects of Interest for Atmospheric Characterization of Transiting Exoplanets with JWST
Hord, B. J. et al., 2024, The Astronomical Journal, Volume 167, Issue 5, id.233, 33 pp.The Discovery and Follow-up of Four Transiting Short-period Sub-Neptunes Orbiting M Dwarfs
Hori, Y. et al., 2024, The Astronomical Journal, Volume 167, Issue 6, id.289, 25 pp.
Gliese 12 b: A Temperate Earth-sized Planet at 12 pc Ideal for Atmospheric Transmission Spectroscopy
Kuzuhara, M. et al., 2024, The Astrophysical Journal Letters, Volume 967, Issue 2, id.L21, 24 pp.
Three short-period Earth-sized planets around M dwarfs discovered by TESS: TOI-5720 b, TOI-6008 b, and TOI-6086 b
Barkaoui, K. et al., 2024, Astronomy & Astrophysics, Volume 687, id.A264, 24 pp.
Detection of an Earth-sized exoplanet orbiting the nearby ultracool dwarf star SPECULOOS-3
Gillon, M. et al., 2024, Nature Astronomy, Volume 8, p. 865-878Climate change in hell: Long-term variation in transits of the evaporating planet K2-22b
Gaidos, E. et al., 2024, Astronomy & Astrophysics, Volume 688, id.L34, 9 pp.
TESS Investigation—Demographics of Young Exoplanets (TI-DYE). II. A Second Giant Planet in the 17 Myr System HIP 67522
Barber, M. G. et al., 2024, The Astrophysical Journal Letters, Volume 973, Issue 1, id.L30, 8 pp.Validation of up to seven TESS planet candidates through multi-colour transit photometry using MuSCAT2 data
Peláez-Torres, A. et al., 2024, Astronomy & Astrophysics, Volume 690, id.A62, 9 pp.
TESS discovery of two super-Earths orbiting the M-dwarf stars TOI-6002 and TOI-5713 near the radius valley
Ghachoui, M. et al., 2024, Astronomy & Astrophysics, Volume 690, id.A263, 19 pp.
Low abundances of TiO and VO on the dayside of KELT-9 b: Insights from ground-based photometric observations
Hayashi, Y. et al., 2024, Publications of the Astronomical Society of Japan, Volume 76, Issue 5, pp.1131-1141A Fourth Planet in the Kepler-51 System Revealed by Transit Timing Variations
Masuda, K. et al., 2024, The Astronomical Journal, Volume 168, Issue 6, id.294, 36 pp.TOI-2015 b: A sub-Neptune in strong gravitational interaction with an outer non-transiting planet
Barkaoui, K. et al., 2025, Astronomy & Astrophysics, Volume 695, id.A281, 25 pp.
Tidally Heated Sub-Neptunes, Refined Planetary Compositions, and Confirmation of a Third Planet in the TOI-1266 System
Greklek-McKeon, M. et al., 2025, The Astronomical Journal, Volume 169, Issue 6, id.292, 28 pp.
The eccentricity distribution of warm sub-Saturns in TESS
Fairnington, T. R. et al., 2025, Monthly Notices of the Royal Astronomical Society, Volume 540, Issue 1, pp. 1144-1162
Discovery of a transiting hot water-world candidate orbiting Ross 176 with TESS and CARMENES
Geraldía-González, S. et al., 2025, Astronomy & Astrophysics, Volume 700, id.A216, 16 pp.
TOI-1846 b: a super-Earth in the radius valley orbiting a nearby M dwarf
Soubkiou, A. et al., 2025, Monthly Notices of the Royal Astronomical Society, Volume 541, Issue 4, pp. 3249-3268
Mori, M. et al., 2025, The Astronomical Journal, Volume 170, id.204, 16pp.
YouTube channel
Asnaro Science
YouTube channel
Asnaro Science
This is a YouTube channel where I tell about our research and my Ph.D. life. Most of the videos are in Japanese, but a few have English subtitles!
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