What property of an extrasolar planet can be determined directly from the Doppler effect data shown in the figure below? What other properties of the planet can then be determined? 
Definitions:
Membrane-bound Receptor
A type of receptor located on the cell membrane that binds to external molecules to initiate a cellular response.
Eicosanoids
Bioactive lipid compounds derived from fatty acids, playing critical roles in inflammation, immunity, and as messengers in the central nervous system.
Prostaglandins
A group of lipid compounds that have diverse hormone-like effects, including mediating inflammation and pain.
Epinephrine
A hormone and neurotransmitter, also known as adrenaline, that increases heart rate, muscle strength, blood pressure, and sugar metabolism.
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