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Dr John Barnes

Profile summary

Professional biography

I am a researcher working in the Astronomy Discipline at the Research Centre for Physical and Earth Sciences in the Open University. My research involves the study of cool stars, exoplanet detection and characterisation. 

See my personal website for more information.


Research interests

My research interests focus on the study of stellar activity, using high resolution spectroscopy. I have used tomographic techniques to obtain some of the first indirect images of spots on G dwarf stars like the Sun, and the least massive M dwarf stars. I have also carried out searches for molecules in close orbiting extrasolar planets and implemented the most precise radial velocity searches for planets at the bottom of the main sequence.

Teaching interests

I have taught a number of courses at different levels, including cosmology, exoplanets, star formation and plasma astrophysics. I have also taught and tutored courses in programming and mathematics.


The variable magnetic field of V889 Her and the challenge of detecting exoplanets around young Suns using Gaussian process regression (2024-03)
Brown, E L; Marsden, S C; Jeffers, S V; Heitzmann, A; Barnes, J R and Folsom, C P
Monthly Notices of the Royal Astronomical Society, 528(3) (pp. 4092-4114)

Combing the Brown Dwarf Desert with Gaia DR3 (2023-12)
Stevenson, Adam T.; Haswell, Carole A.; Barnes, John R. and Barstow, Joanna K.
Monthly Notices of the Royal Astronomical Society, 526(4) (pp. 5155-5171)

DMPP-4: candidate sub-Neptune mass planets orbiting a naked-eye star (2023-10)
Barnes, J. R.; Standing, M. R.; Haswell, C. A.; Staab, D.; Doherty, J. P. J.; Waller-Bridge, M.; Fossati, L.; Soto, M.; Anglada-Escudé, G.; Llama, J.; McCune, C. and Lewis, F. W.
Monthly Notices of the Royal Astronomical Society, 524(4) (pp. 5196-5212)

DMPP-3: confirmation of short-period S-type planet(s) in a compact eccentric binary star system, and warnings about long-period RV planet detections (2023-05-23)
Stevenson, Adam T.; Haswell, Carole A.; Barnes, John; Barstow, Joanna K. and Ross, Zachary
Monthly Notices of the Royal Astronomical Society(523) (pp. 189-207)

A machine learning approach for correcting radial velocities using physical observables (2023)
Perger, M.; Anglada-Escudé, G.; Baroch, D.; Lafarga, M.; Ribas, I.; Morales, J. C.; Herrero, E.; Amado, P. J.; Barnes, J.R.; Caballero, J. A.; Jeffers, S. V.; Quirrenbach, A. and Reiners, A.
Astronomy & Astrophysics, 672, Article A118

A Method to Achieve High Dynamic Range in a CMOS Image Sensor Using Interleaved Row Readout (2022-11-15)
Wocial, Thomas; Stefanov, Konstantin D.; Martin, William E.; Barnes, John R. and Jones, Hugh R.A.
IEEE Sensors Journal, 22(22) (pp. 21619-21627)

Detailed stellar activity analysis and modelling of GJ 832 (2022-08)
Gorrini, P.; Astudillo-Defru, N.; Dreizler, S.; Damasso, M.; Díaz, R. F.; Bonfils, X.; Jeffers, S. V.; Barnes, J. R.; Del Sordo, F.; Almenara, J.-M.; Artigau, E.; Bouchy, F.; Charbonneau, D.; Delfosse, X.; Doyon, R.; Figueira, P.; Forveille, T.; Haswell, C. A.; López-González, M. J.; Melo, C.; Mennickent, R. E.; Gaisné, G.; Morales, N. Morales; Murgas, F.; Pepe, F.; Rodríguez, E.; Santos, N. C.; Tal-Or, L.; Tsapras, Y. and Udry, S.
Astronomy & Astrophysics, 664, Article A64

The CARMENES search for exoplanets around M dwarfs - Benchmarking the impact of activity in high-precision radial velocity measurements (2022-07-08)
Jeffers, S. V.; Barnes, J.R.; Schöfer, P.; Quirrenbach, A.; Zechmeister, M.; Amado, P. J.; Caballero, J. A.; Fernández, M.; Rodríguez, E.; Ribas, I.; Reiners, A.; Cardona Guillén, C.; Cifuentes, C.; Czesla, S.; Hatzes, A. P.; Kürster, M.; Montes, D.; Morales, J. C.; Pedraz, S. and Sadegi, S.
Astronomy & Astrophysics, 663, Article A27

Exoplanet mass estimation for a sample of targets for the Ariel mission (2022)
Barnes, J. R. and Haswell, C. A.
Experimental Astronomy, 53 (pp. 589-606)

A possible transit of a disintegrating exoplanet in the nearby multiplanet system DMPP-1 (2020-05)
Jones, Mark; Haswell, Carole; Barnes, John; Staab, Daniel and Heller, René
Astrophysical Journal Letters, 895, Article L17(1)

Doppler Imaging and Differential Rotation of σ2 Coronae Borealis Using SONG* (2020-04-28)
Xiang, Yue; Gu, Shenghong; Cameron, A. Collier; Barnes, J. R.; Christensen-Dalsgaard, J.; Grundahl, F.; Antoci, V.; Andersen, M. F. and Pallé, P. L.
Astrophysical Journal, 893, Article 164(2)

Dispersed Matter Planet Project discoveries of ablating planets orbiting nearby bright stars (2020-04)
Haswell, Carole A.; Staab, Daniel; Barnes, John R.; Anglada-Escudé, Guillem; Fossati, Luca; Jenkins, James S.; Norton, Andrew J.; Doherty, James P. J. and Cooper, Joseph
Nature Astronomy, 4(4) (pp. 408-418)

A compact multi-planet system around a bright nearby star from the Dispersed Matter Planet Project (2020-04)
Staab, D.; Haswell, C. A.; Barnes, J. R.; Anglada-Escudé, G.; Fossati, L.; Doherty, J. P. J.; Cooper, J.; Jenkins, J. S.; Díaz, M. R. and Soto, M. G.
Nature Astronomy, 4(4) (pp. 399-407)

An ablating 2.6 M planet in an eccentric binary from the Dispersed Matter Planet Project (2020-04)
Barnes, John R,; Haswell, Carole A.; Staab, Daniel; Anglada-Escudé, Guillem; Fossati, Luca; Doherty, James P. J.; Cooper, Joseph; Jenkins, James S.; Díaz, Matías R.; Soto, Maritza G. and Peña Rojas, Pablo A.
Nature Astronomy, 4(4) (pp. 419-426)

The CARMENES search for exoplanets around M dwarfs. Characterization of the nearby ultra-compact multiplanetary system YZ Ceti. (2020-04)
Stock, S.; Kemmer, J.; Reffert, S.; Trifonov, T.; Kaminski, A.; Dreizler, S.; Quirrenbach, A.; Caballero, J. A.; Reiners, A.; Jeffers, S. V.; Anglada-Escudé, G.; Ribas, I.; Amado, P. J.; Barrado, D.; Barnes, J. R.; Bauer, F. F.; Berdiñas, Z. M.; Béjar, V. J. S.; Coleman, G. A. L.; Cortés-Contreras, M.; Díez-Alonso, E.; Domínguez-Fernández, A. J.; Espinoza, N.; Haswell, C. A.; Hatzes, A.; Henning, T.; Jenkins, J. S.; Jones, H. R. A.; Kossakowski, D.; Kürster, M.; Lafarga, M.; Lee, M. H.; López González, M. J.; Montes, D.; Morales, J. C.; Morales, N.; Pallé, E.; Pedraz, S.; Rodríguez, E.; Rodríguez-López, C. and Zechmeister, M.
Astronomy & Astrophysics, 636, Article A119

The first Doppler imaging of the active binary prototype RS Canum Venaticorum (2020-03)
Xiang, Yue; Gu, Shenghong; Wolter, U.; Schmitt, J. H. M. M.; Cameron, A. Collier; Barnes, J. R.; Mittag, M.; Perdelwitz, V. and Kohl, S.
Monthly Notices of the Royal Astronomical Society, 492(3) (pp. 3647-3656)

Red Dots: A temperate 1.5 Earth-mass planet candidate in a compact multi-terrestrial planet system around GJ 1061 (2020-03)
Dreizler, S.; Jeffers, S. V.; Rodríguez, E.; Zechmeister, M.; Barnes, J. R.; Haswell, C. A.; Coleman, G. A. L.; Lalitha, S.; Soto, D. Hidalgo; Strachan, J. B. P.; Hambsch, F.-J.; López-González, M. J.; Morales, N.; López, C. Rodríguez; Berdiñas, Z. M.; Ribas, I.; Pallé, E.; Reiners, A. and Anglada-Escudé, G.
Monthly Notices of the Royal Astronomical Society, 493(1) (pp. 536-550)

A multiplanet system of super-Earths orbiting the brightest red dwarf star GJ 887 (2020)
Jeffers, S. V.; Dreizler, S.; Barnes, J. R.; Haswell, C. A.; Nelson, R. P.; Rodríguez, E.; López-González, M. J.; Morales, N.; Luque, R.; Zechmeister, M.; Vogt, S. S.; Jenkins, J. S.; Palle, E.; Berdi ñas, Z. M.; Coleman, G. A. L.; Díaz, M. R.; Ribas, I.; Jones, H. R. A.; Butler, R. P.; Tinney, C. G.; Bailey, J.; Carter, B. D.; O’Toole, S.; Wittenmyer, R. A.; Crane, J. D.; Feng, F.; Shectman, S. A.; Teske, J.; Reiners, A.; Amado, P. J. and Anglada-Escudé, G.
Science, 368(6498) (pp. 1477-1481)

A candidate super-Earth planet orbiting near the snow line of Barnard’s star (2018-11-15)
Ribas, I.; Tuomi, M.; Reiners, A.; Butler, R. P.; Morales, J. C.; Perger, M.; Dreizler, S.; Rodríguez-López, C.; González Hernández, J. I.; Rosich, A.; Feng, F.; Trifonov, T.; Vogt, S. S.; Caballero, J. A.; Hatzes, A.; Herrero, E.; Jeffers, S. V.; Lafarga, M.; Murgas, F.; Nelson, R. P.; Rodríguez, E.; Strachan, J. B. P.; Tal-Or, L.; Teske, J.; Toledo-Padrón, B.; Zechmeister, M.; Quirrenbach, A.; Amado, P. J.; Azzaro, M.; Béjar, V. J. S.; Barnes, J. R.; Berdiñas, Z. M.; Burt, J.; Coleman, G.; Cortés-Contreras, M.; Crane, J.; Engle, S. G.; Guinan, E. F.; Haswell, C. A.; Henning, Th.; Holden, B.; Jenkins, J.; Jones, H. R. A.; Kaminski, A.; Kiraga, M.; Kürster, M.; Lee, M. H.; López-González, M. J.; Montes, D.; Morin, J.; Ofir, A.; Pallé, E.; Rebolo, R.; Reffert, S.; Schweitzer, A.; Seifert, W.; Shectman, S. A.; Staab, D.; Street, R. A.; Suárez Mascareño, A.; Tsapras, Y.; Wang, S. X. and Anglada-Escudé, G.
Nature, 563(7731) (pp. 365-368)

The relation between stellar magnetic field geometry and chromospheric activity cycles – II The rapid 120-day magnetic cycle of τ Bootis (2018-10-01)
Jeffers, S. V.; Mengel, M.; Moutou, C.; Marsden, S. C.; Barnes, J. R.; Jardine, M. M.; Petit, P.; Schmitt, J. H. M. M.; See, V.; Vidotto, A. A. and the BCool collaboration,
Monthly Notices of the Royal Astronomical Society, 479(4) (pp. 5266-5271)

AD Leonis: Radial Velocity Signal of Stellar Rotation or Spin–Orbit Resonance? (2018-05)
Tuomi, Mikko; Jones, Hugh R. A.; Barnes, John R.; Anglada-Escudé, Guillem; Butler, R. Paul; Kiraga, Marcin and Vogt, Steven S.
The Astronomical Journal, 155, Article 192(5)

High-cadence spectroscopy of M-dwarfs – II. Searching for stellar pulsations with HARPS (2017-08-21)
Berdiñas, Z. M.; Rodríguez-López, C.; Amado, P. J.; Anglada-Escudé, G.; Barnes, J. R.; MacDonald, J.; Zechmeister, M. and Sarmiento, L. F.
Monthly Notices of the Royal Astronomical Society, 469(4) (pp. 4268-4282)

Calculations of periodicity from Hα profiles of Proxima Centauri (2017-06)
Collins, John M.; Jones, Hugh R. A. and Barnes, John R.
Astronomy & Astrophysics, 602, Article A48

Recovering planet radial velocity signals in the presence of starspot activity in fully convective stars (2017-04-30)
Barnes, J.R.; Jeffers, S. V.; Anglada-Escudé, G.; Haswell, C.A.; Jones, H. R. A.; Tuomi, M.; Feng, F.; Jenkins, J. S. and Petit, P.
Monthly Notices of the Royal Astronomical Society, 466(2) (pp. 1733-1740)

SALT observations of the Chromospheric Activity of Transiting Planet Hosts: Mass Loss and Star Planet Interactions (2017-04)
Staab, D.; Haswell, C.A.; Smith, Gareth D.; Fossati, L.; Barnes, J.R.; Busuttil, R. and Jenkins, J.S.
Monthly Notices of the Royal Astronomical Society, 466(1) (pp. 738-748)

New planetary systems from the Calan–Hertfordshire Extrasolar Planet Search (2017-04)
Jenkins, J. S.; Jones, H. R. A.; Tuomi, M.; Díaz, M.; Cordero, J. P.; Aguayo, A.; Pantoja, B.; Arriagada, P.; Mahu, R.; Brahm, R.; Rojo, P.; Soto, M. G.; Ivanyuk, O.; Becerra Yoma, N.; Day-Jones, A. C.; Ruiz, M. T.; Pavlenko, Y. V.; Barnes, J. R.; Murgas, F.; Pinfield, D. J.; Jones, M. I.; López-Morales, M.; Shectman, S.; Butler, R. P. and Minniti, D.
Monthly Notices of the Royal Astronomical Society, 466(1) (pp. 443-473)

Surprisingly different star-spot distributions on the near equal-mass equal-rotation-rate stars in the M dwarf binary GJ 65 AB (2017)
Barnes, J. R.; Jeffers, S. V.; Haswell, C. A.; Jones, H. R. A.; Shulyak, D.; Pavlenko, Ya. V. and Jenkins, J. S.
Monthly Notices of the Royal Astronomical Society, 471(1) (pp. 811-823)

The origin of the excess transit absorption in the HD 189733 system: planet or star? (2016-10-11)
Barnes, J. R.; Haswell, C. A.; Staab, D. and Anglada-Escudé, G.
Monthly Notices of the Royal Astronomical Society, 462(1) (pp. 1012-1028)

A terrestrial planet candidate in a temperate orbit around Proxima Centauri (2016-08-25)
Anglada-Escudé, Guillem; Amado, Pedro J.; Barnes, John; Berdiñas, Zaira M.; Butler, R. Paul; Coleman, Gavin A. L.; de la Cueva, Ignacio; Dreizler, Stefan; Endl, Michael; Giesers, Benjamin; Jeffers, Sandra V.; Jenkins, James S.; Jones, Hugh R. A.; Kiraga, Marcin; Kürster, Martin; López-González, Marίa J.; Marvin, Christopher J.; Morales, Nicolás; Morin, Julien; Nelson, Richard P.; Ortiz, José L.; Ofir, Aviv; Paardekooper, Sijme-Jan; Reiners, Ansgar; Rodríguez, Eloy; Rodrίguez-López, Cristina; Sarmiento, Luis F.; Strachan, John P.; Tsapras, Yiannis; Tuomi, Mikko and Zechmeister, Mathias
Nature, 536(7617) (pp. 437-440)

High-cadence spectroscopy of M dwarfs – I. Analysis of systematic effects in HARPS-N line profile measurements on the bright binary GJ 725A+B (2016-07-11)
Berdiñas, Z. M.; Amado, P. J.; Anglada-Escudé, G.; Rodríguez-López, C. and Barnes, J.
Monthly Notices of the Royal Astronomical Society, 459(4) (pp. 3551-3564)

The first Doppler images of the eclipsing binary SZ Piscium (2016-02-11)
Xiang, Yue; Gu, Shenghong; Cameron, A. Collier; Barnes, J. R. and Zhang, Liyun
Monthly Notices of the Royal Astronomical Society, 456(1) (pp. 314-322)

A maximum entropy approach to detect close-in giant planets around active stars (2015-12)
Petit, P.; Donati, J.-F.; Hébrard, E.; Morin, J.; Folsom, C. P.; Böhm, T.; Boisse, I.; Borgniet, S.; Bouvier, J.; Delfosse, X.; Hussain, G.; Jeffers, S. V.; Marsden, S. C. and Barnes, J. R.
Astronomy & Astrophysics, 584 (A84)

Starspot distributions on fully convective M dwarfs: implications for radial velocity planet searches (2015-10-07)
Barnes, J. R.; Jeffers, S. V.; Jones, H. R. A.; Pavlenko, Ya. V.; Jenkins, J. S.; Haswell, C. A. and Lohr, M. E.
The Astrophysical Journal, 812(1) (p 42)

Analysis of combined radial velocities and activity of BD+20 1790: evidence supporting the existence of a planetary companion (2015)
Hernán-Obispo, M.; Tuomi, M.; Gálvez-Ortiz, M. C.; Golovin, A.; Barnes, J. R.; Jones, H. R. A.; Kane, S. R.; Pinfield, D.; Jenkins, J. S.; Petit, P.; Anglada-Escudé, G.; Marsden, S. C.; Catalán, S.; Jeffers, S. V.; de Castro, E.; Cornide, M.; Garcés, A.; Jones, M. I.; Gorlova, N. and Andreev, M.
Astronomy & Astrophysics, 576, Article A66

Photospheric acne at the bottom of the main-sequence: Doppler images of M4.5 - M9V stars (2016)
Barnes, John; Haswell, Carole; Jeffers, Sandra; Jones, Hugh; Pavlenko, Yakiv; Lohr, Marcus and Jenkins, James
In : The 19th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun (Jun 2016, Uppsala, Sweden)

Characterising exoplanets and their environment with UV transmission spectroscopy (2015-03-04)
Fossati, L.; Bourrier, V.; Ehrenreich, D.; Haswell, C. A.; Kislyakova, K.G.; Lammer, H.; Lecavelier des Etangs, A.; Alibert, Y.; Ayres, T. R.; Ballester, G. E.; Barnes, J.; Bisikalo, D. V.; Cameron, A. Collier; Czesla, S.; Desert, J.-M.; France, K.; Gudel, M.; Guenther, E.; Helling, Ch.; Heng, K.; Homstrom, M.; Kaltenegger, L.; Koskinen, T.; Lanza, A. F.; Linsky, J. L.; Mordasini, C.; Pagano, I.; Pollacco, D.; Rauer, H.; Reiners, A.; Salz, M.; Schneider, P. C.; Shematovich, V. I.; Staab, D.; Vidotto, A. A.; Wheatley, P. J.; Wood, B. E. and Yelle, R. V.
Space Telescope Science Institute