Petri Tikkanen
A5088015195- Pulsars and Gravitational Waves Research
- Astrophysical Phenomena and Observations
- Astro and Planetary Science
- Gamma-ray bursts and supernovae
- Stellar, planetary, and galactic studies
- Astronomical Observations and Instrumentation
University of Southern Queensland
2024
Hankasalmi Observatory
2009
Abstract We systematically surveyed period variations of superhumps in SU UMa-type dwarf novae based on newly obtained data and past publications. In many systems, the evolution superhump is found to be composed three distinct stages: an early evolutionary stage with a longer period, middle varying periods, final shorter, stable period. During stage, systems periods less than 0.08 d show positive derivatives. present observational characteristics these stages give greatly improved...
Abstract We report the discovery and confirmation of Transiting Exoplanet Survey Satellite (TESS) single-transit, warm dense sub-Saturn, TIC 139270665 b. This planet is unusually for its size: with a bulk density 2.13 g cm −3 (0.645 R J , 0.463 M ), it densest sub-Saturn TESS family. It orbits metal-rich G2 star. also found evidence second planet, c, longer period <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msubsup> <mml:mrow> <mml:mn>1010</mml:mn>...