1. Vuitton, V., Yelle, R.V., Klippenstein, S.J., Hörst, S.M., Lavvas, P. (2019). Simulating the density of organic species in the atmosphere of Titan with a coupled ion-neutral photochemical model. Icarus, 324, p. 120-197. @


  1. Evans, T., Sing, D.K., Goyal, J.M., Nikolov, N., Marley, M., Zahnle, K., Henry, G.W., Barstow, J.K., Alam, M.K., Sanz-Forcada, J., Kataria, Tiffany; Lewis, Nikole K.; Lavvas, P., Ballester, Gilda E.; Ben-Jaffel, Lotfi; Blumenthal, Sarah D.; Bourrier, V., Drummond, B., García Muñoz, A., López-Morales, M., Tremblin, P., Ehrenreich, D., Wakeford, H.R., Buchhave, L.A., Lecavelier des Etangs, A., Hébrard, É., Williamson, M.H. (2018). An optical transmission spectrum for the ultra-hot Jupiter WASP-121b measured with the Hubble Space Telescope. The Astronomical Journal, 156, id.283, 34pp. @
  2. Bourrier, V., Lecavelier Des Etangs, A., Ehrenreich, D., Sanz-Forcada, J., Allart, R., Ballester, G.E., Buchhave, L.A., Cohen, O., Deming, D., Evans, T.M., Garcia Munoz, A., Henry, G.W., Kataria, T., Lavvas, P., Lewis, N., Lopez-Morales, M., Marley, M., Sing, D.K, Wakeford, H.R. (2018). Hubble PanCET : An extended upper atmosphere of neutral hydrogen around the warm Neptune GJ 3470b. Astronomy & Astrophysics, 620, A147. @
  3. Coustenis, A., Jennings, D.E., Achterberg, R.K., Bambasidis, G., Nixon, C.A., Lavvas, P., Cottini, V., Flasar, F.M., 2018. Seasonal evolution of Titan’s stratosphere near the poles. Ap.J.Lett., 854, (2), i.d. L30, 7pp. @
  4. Nikolov, N., Sing, D.K., Goyal, J., Henry, G.W., Wakeford, H.R., Evans, T.M., Lopez-Morales, M., Garcia-Munoz, A., Ben-Jaffel, L., Sanz-Forcada, J., Ballester, G.E., Kataria, T., Barstow, J.K., Bourrier, V., Buchhave, L.A., Cohen, O., Deming, D., Ehrenreich, D., Knutson, H., Lavvas, P., Lecavelier des Etangs, A., Lewis, N.K., Mandell, A.M., Williamson, M.H., 2018. Hubble PanCET: an isothermal day-side atmosphere for the bloated gas-giant HAT-P-32Ab. MNRAS,474,(2), p.1705-1717. @
  5. Young, L., Kammer, J., Steffl, A.J., Gladstone, G.R., Summers, M.E., Strobel, D.F., Hinson, D.P., Stern, S.A., Weaver, H.A., Olkin, C.B., Ennico, K., McComas, D.J., Cheng, A.F., Gao, P., Lavvas, P., Linscott, I.R., Wong, M.L., Yung, Y.L., Cunningham,N., Davis, M., Parker,J.W., Schindhelm, E., Siegmund, O.H.W., Stone, J., Retherford, K., Versteeg, M., 2018. Structure and composition of Pluto’s atmosphere from the New Horizons solar ultraviolet occultation. Icarus, 300, p. 174-199. @


  1. Lavvas, P. & Koskinen, T., 2017. Aerosol properties in the atmospheres of extrasolar giant planets. The Astrophysical Journal, 847(32), 20pp. @
  2. Evans, T., Sing, D.K., Kataria, T., Goyal, J., Nikolov, N., Wakeford, H.R., Deming, D., Marley, M.S., Amundsen, D.S., Ballester, G.E., Barstow, J.K., Ben-Jaffel, L., Bourrier, V., Buchhave, L.A., Cohen, O., Ehrenreich, D., García Muñoz, A., Henry, G.W., Knutson, H., Lavvas, P., Etangs, A. L.D., Lewis, N.K., López-Morales, M., Mandell, A.M., Sanz-Forcada, J., Tremblin, P., Lupu, R., 2017. An ultrahot gas-giant exoplanet with a stratosphere. Nature, Volume 548, Issue 7665, pp. 58-61. @
  3. Seignovert, B., Rannou, P., Lavvas, P., Cours, T., West, R.A., 2017. Aerosols optical properties in Titan’s detached haze layer before the equinox. Icarus, Volume 292, p. 13-21. @
  4. Cheng, A.F., Summers, M.E., Gladstone, G.R., Strobel, D.F., Young, L.A., Lavvas, P., Kammer, J.A., Lisse, C.M., Parker, A.H., Young, E.F., Stern, S.A., Weaver, H.A., Olkin, C.B., Ennico, K., 2017. Haze in Pluto’s atmosphere. Icarus, 290, pp. 112-133. @
  5. García Muñoz, A., Lavvas, P., West, R. A., 2017. Titan brighter at twilight than in daylight. Nature Astronomy, 1, id. 0114. @
  6. Lellouch, E., Gurwell, M., Butler, B., Fouchet, T., Lavvas, P., Strobel, D.F., Sicardy, B., Moullet, A., Moreno, R., Bockelée-Morvan, D., Biver, N., Young, L., Lis, D., Stansberry, J., Stern, A., Weaver, H., Young, E., Zhu, X., Boissier, J., 2017. Detection of CO and HCN in Pluto’s atmosphere with ALMA. Icarus, 286, pp. 289-307. @
  7. Wakeford, H.R., Stevenson, K.B., Lewis, N.K., Sing, D.K., López-Morales, M., Marley, M., Kataria, T., Mandell, A., Ballester, G.E., Barstow, J., Ben-Jaffel, L., Bourrier, V., Buchhave, L.A., Ehrenreich, D., Evans, T., García-Muñoz, A., Henry, G., Knutson, H., Lavvas, P., Lecavelier des Etangs, A., Nikolov, N., Sanz-Forcada, J., 2017. HST PanCET program: A cloudy atmosphere for the promising JWST target WASP-101 b. Ap.J. Letters, 835, Issue 1, article id. L12, 6 pp. @


  1. Grundy W.M., …, Lavvas P., et al. 2016. The formation of Charon’s red poles from seasonally cold-trapped volatile. Nature, 539, Issue 7627, pp. 65-68. @
  2. Vigren E., Galand M., Wellbrock A., Coates A. J., Cui J., Edberg N. J. T., Lavvas P., Sagnières L., Snowden D., Vuitton V., Wahlund J.-E., 2016. Suprathermal Electrons in Titan’s Sunlit Ionosphere: Model-Observation Comparisons. Ap. J., 826, Issue 2, article id. 131, 11 pp. @
  3. Cui J., Cao Y-T., Lavvas P., Koskinen T., 2016. The variability of HCN in Titan’s upper atmosphere as implied by the Cassini Ion-Neutral Mass Spectrometer measurements. Ap.J. Letters, 826, id. L5. @
  4. Coustenis A., Jennings D. E., Achterberg R. K., Bampasidis G., Lavvas P., Nixon C. A., Teanby N. A., Anderson C. M., Cottini V., Flasar F. M., 2016. Titan’s temporal evolution in stratospheric trace gases near the poles. Icarus, 270, p. 409-420. @
  5. West R.A., Del Genio A.D., Barbara J.M., Toledo D., Lavvas P., Rannou P., Turtle E.P., Perry J.(2016). Cassini Imaging Science subsystem observations of Titan’s south polar cloud. Icarus, 270, p.399-408. @
  6. Rannou P., Toledo D., Lavvas P., D’Aversa E., Moriconim M.L., Adriani A., Le Mouelic S., Sotin C., Brown R., 2016. Titan’s surface spectra at the Huygens landing site and Shangri-La. Icarus, 270, p. 291- 306. @
  7. Gladstone R.,…, Lavvas P. et al., 2016. The atmosphere of Pluto as observed by New Horizons. Science, 351, id. aad8866. @


  1. Lavvas P., Yelle R.V., Heays A.N., Campbell L., Brunger M.J., Galand M., Vuitton V., 2015. N2 state population in Titan’s atmosphere. Icarus, 260, p.29-59. @
  2. Sagnieres L.B.M., Galand M., Cui J., Lavvas P., Vigren E., Vuitton V., Yelle R.V., Wellbrock A., Coates A., 2015. Influence of local ionization on ionospheric densities in Titan’s upper atmosphere. JGR, 120, 5899. @
  3. Vigren E., Galand M., Yelle R.V., Wellbrock A., Coates A.J., Snowden D., Cui J., Lavvas P., Edberg N.J.T., Shebanits O., Wahlund J.-E., Vuitton V., Mandt K., 2015. Ionization balance in Titan’s night side ionosphere. Icarus, 248, p.539-546. @
  4. Vigren E., Galand M., Lavvas P., Eriksson A.I., Wahlund J-E, 2015. On the possibility of significant electron depletion due to nanograin charging in the coma of comet 67p/Churyumov-Gerasimenko near perihelion. Ap.J., 798, 130. @


  1. Koskinen T., Yelle R.V., Lavvas P., Cho J. Y-K., 2014. Electrodynamics on extrasolar giant planets. Ap.J.,796, 16. @
  2. Lavvas P., Koskinen T., Yelle R.V., 2014. Electrons densities and alkali atoms in exoplanet atmospheres. Ap.J., 796, 15. @
  3. Lavvas P., West R.A., Gronoff G., Rannou P., 2014. Titan’s emission processes during eclipse. Icarus, 241, 397-408. @
  4. Vigren E., Galand M., Shebanits O., Wahlund J.-E., Geppert W.D., Lavvas P., Vuitton V., Yelle R.V., 2014. Increasing positive ion number densities below the peak of ion-electron pair production in Titan’s ionosphere. Ap.J., 786, 69,5. @
  5. Koskinen T., Lavvas P., Harris M.J., Yelle R.V., 2014. Thermal escape for extrasolar giant planets. Trans. R. Soc. A 372: 20130089. @


  1. Lavvas P., Yelle R.V., Koskinen T., Bazin A., Vuitton V., Vigren E., Galand M., Wellbrock A., Coates A.J., Wahlund J.-E., Crary F.J., Snowden D., 2013. Aerosol growth in Titan’s ionosphere. PNAS, doi/10.1073/pnas.1217059110. @
  2. Coustenis A., Bambasidis G., Achtenberg R.K., Lavvas P., Jennings D.E., Nixon C.A., Teanby N.A., Vinatier S., Flasar F.M., Carlson R.C., Orton G., Romani P.N., Guandique E.A., Stamogiorgos S., 2013. Evolution of the stratospheric temperature and chemical composition over one Titanian year. Ap.J, 79, 177, 9. @
  3. Koskinen T. T., Harris M. J., Yelle R. V., Lavvas P., 2013. The escape of heavy atoms from the ionosphere of HD209458b. I. A photochemical-dynamical model of the thermosphere. Icarus, doi/10.1016/j.icarus.2012.09.027. @
  4. Koskinen T. T., Yelle R. V., Harris M. J., Lavvas P., 2013. The escape of heavy atoms from the ionosphere of HD209458b. II. Interpretation of the observations. Icarus, doi/1016/j.icarus.2012.09.026. @
  5. Snowden D., Yelle R. V., Galand M., Coates A. J., Wellbrock A., Jones G. H., Lavvas P., 2013. Auroral electron precipitation and flux tube erosion in Titan’s upper atmosphere, Icarus, 226, 186-204. @
  6. Vigren E.S., Galand M., Yelle R.V., Cui J., Wahlund J.E., Agren K., Lavvas P., Mueller-Wodarg I.C.F., Strobel D.F., 2013. On the thermal electron balance in Titan’s sunlit upper atmosphere. Icarus, 223, 234-251. @
  7. Dutuit O., Carrasco N., Thissen R., Vuitton V., Alcaraz C., Pernot P., Balucani N., Casavecchia P., Canosa A., Le Picard S., Loison J.- C., Herman Z., Zabka J., Ascenzi D., Tosi P., Franceschi P., Price S. D., Lavvas P., 2012. Critical review of N, N+, N2+, N++ and N2++ main production processes and reactions of relevance to Titan’s atmosphere. Astrophysical Journal Supplement Series, 204, 20. @


  1. Bampasidis G., Coustenis A., Achterberg R.K., Vinatier S., Lavvas P., Nixon C.A., Jennings D.E., Teanby N.A., Flasar F.M., Carlson R.C., Moussas X., Preka-Papadema P., Romani P.N., Guandique E.A., Stamogiorgos S., 2012. Thermal and chemical structure variations in Titan’s stratosphere during the Cassini mission. Ap.J., 760, 144. @
  2. Cordier D., Mousis O., Lunine J.I., Lebonnois S., Rannou P., Lavvas P., Lobo L.Q., Ferreira A.G.M., 2012. Titan’s lakes chemical composition: sources of uncertainties and variability. PSS, 61, 99-107. @
  3. Vuitton V., Yelle R.V., Lavvas P., Klippenstein, S., 2012. Rapid association reactions at low pressure: impact on the formation of hydrocarbons on Titan. Ap.J., 744, 11. @


  1. Koskinen T.T., Yelle R.V., Snowden D.S., Lavvas P., Sandel B.R., Capalbo F.J., Benilan Y., West R.A., 2011. The mesosphere and lower thermosphere of Titan revealed by Cassini/UVIS stellar occultations. Icarus, 216, 507-534. @
  2. Cui J., Yelle R.V., Muller-Wodarg I.C.F., Lavvas P., Galand M., 2011. The implications of the H2 variability in Titan’s exosphere. JGR, 116, A11324. @
  3. Lavvas P., Griffith C.A., Yelle R.V., 2011. Condensation in Titan’s atmosphere at the Huygens landing site. Icarus, 215, 732-750. @
  4. Lavvas P., Galand M., Yelle R.V., Hayes A.N., Lewis B.R., Lewis G.,R. Coates A.J., 2011. Energy deposotion and primary chemical products in Titan’s atmosphere. Icarus, 213, 233-251. @
  5. West A.R., Balloch J., Dumont P., Lavvas P., Lorenz R., Rannou P., Ray T., Turtle E.P., 2011. The evolution of Titan’s detached haze layer near equinox in 2009. GRL, 38, L06204. @
  6. Lavvas P., Sander M., Kraft M., Imanaka H., 2011. Surface chemistry and particle shape. Processes for the evolution of aerosols in Titan’s atmosphere. Astrophys. J., 727. @


  1. Lavvas P., Yelle R.V., Griffith C.A., 2010. Titan’s vertical aerosol structure at the Huygens landing site: Constraints on particle size, density, and refractive index. Icarus, 210, 832-842. @
  2. Koskinen T.T., Yelle R.V., Lavvas P., Lewis N.K., 2010. Characterizing the thermosphere of HD209458b with UV transit observations. Ap. J., 723, 116-128. @
  3. Cordier D., Mousis O., Lunine J.I., Lebonnois S., Lavvas P., Lobo L.Q., Ferreira A.G.M., 2010. About the possible role of hydrocarbon lakes in the origin of Titan’s noble gas atmospheric depletion. Astrophys. J., 721, 117-120. @
  4. Coustenis A., Jennings D.E., Nixon C.A., Achterberg R.K., Lavvas P., Vinatier S., Teanby N.A., Bjoraker G.L., Carlson R.C., Piani L., Bampasidis G., Flasar F.M., Romani P.N., 2009. Titan trace gaseous composition from CIRS at the end of the Cassini-Huygens prime mission. Icarus, 207, 461-476. @
  5. Yelle R.V., Vuitton V., Lavvas P., Klippenstein S.J., Smith M.A., Horst S.M., Cui J., 2010. Formation of NH3 and CH2NH in Titan’s upper atmosphere. Faraday Discussions, 147, 31. @


  1. Cordier D., Mousis O., Lunine J.I., Lavvas P., Vuitton V., 2009. An estimate of the chemical composition of Titan’s lakes. Ap. J. Letters, Astrophys. J., 707, 128-131. @@
  2. Vuitton V., Lavvas P., Yelle R.V., Galand M., Wellbrock A., Lewis G.R., Coates A.J., Wahlund J.-E., 2009. Negative ion chemistry in Titan’s atmosphere. Planet. Space Sci., 57, 1558-1572. @
  3. Thissen R., Vuitton V., Lavvas P., Lemaire J., Dehon C., Dutuit O., Smith M.A., Turchini S., Catone D., Yelle R.V., Pernot P., Somogyi A., Coreno M., 2009. Laboratory studies of molecular growth in the Titan atmosphere. J. Phys. Chem. A., 113, 11211-11220. @
  4. Cui J., Galand M., Yelle R.V., Vuitton V., Wahlund J.-E., Lavvas P., Muller-Wodarg I.C.F., Cravens T.E., Kasprzak W.T., Waite Jr. J.H., 2009. Diurnal variations of Titan’s ionosphere. J. Geophys. Res. – Space, 114, A06310, doi:10.1029/2009JA014228. @
  5. Lavvas P., Yelle R.V., Vuitton V., 2009. The detached haze layer in Titan’s mesosphere. Icarus, 201, 626-633. @
  6. Coustenis A.,…, Lavvas P., et al. 2009. TandEM: Titan and Enceladus mission. Experimental Astronomy, 23, 893-946. @
  7. Vuitton V., Yelle R.V., Lavvas P., 2009. Composition and chemistry of Titan’s thermosphere and ionosphere. Phil. Trans. R. Soc. A. 367, p. 729 – 741. @


  1. Lavvas P., Coustenis A., Vardavas I.M., 2008. Coupling photochemistry with haze formation in Titan’s atmosphere. Part I: Model description, Planet. Space Sci., 56, 27-66. @
  2. Lavvas P., Coustenis A., Vardavas I.M., 2008. Coupling photochemistry with haze formation in Titan’s atmosphere. Part II: Results and validation with Cassini/Huygens data, Planet. Space Sci., 56, 67-99. @


  1. Lavvas P., 2007. Spatial and temporal variability in the atmosphere and surface of Titan: Simulation and interpretation through space and ground-based observations. PhD Thesis University of Crete, Greece. @